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50 cities with the best air quality in the United States

when you go for a hike or open a window to breathe the summer breeze, air quality may not be your most concern, but it will have a significant impact on your life. Poor air quality can increase the incidence of asthma, heart disease and lung cancer. To raise awareness of air quality throughout the United States, the American Lung Association publishes an annual air condition report. The association divides metropolitan areas into three categories: Short-term particulate pollution, annual particulate pollution and ozone pollution. Read on to see if you can breathe the cleanest air in the United States and find out what we recommend to enjoy it.

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48. Charleston, South Carolina this charming southern coastal city is the oldest city in South Carolina. Its gorgeous, well preserved buildings and pristine beaches make it the most popular tourist destination in North America. Go golfing along the coast or take a cruise ship to explore the site where the civil war began in Fort Sumter.

related: learn more about visiting Charleston, South Carolina.

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48. Salisbury, Maryland, was founded in 1732 and is located at the source of the wacomico River, making it the seat of wacomico county. Although many historic buildings were destroyed by fire in 1860 and 1886, visitors can still visit the ancient castle peak church, baiyangshan tower and Pemberton hall. Every third Friday, the city hosts a block party to celebrate local art, music and business.

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48. Lawrence University in Appleton, Wisconsin was founded before Appleton in 1847. According to American news and world report, about a quarter of liberal arts students have completed their degrees at the Conservatory of music. You can visit their 85 acre campus, or visit the history museum in the castle, where Fox Valley's history is preserved. Visitors can also visit the hearthstone historic house museum, the country's first hydroelectric central power station.

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45. Sioux Falls, the largest city in South Dakota, is named after a series of waterfalls on the Great Sioux river. Native Americans lived in the area for at least 1500 years before the arrival of Europeans. Visitors can visit the 123 acre waterfall Park, the waterfalls and some of the city's first industrial buildings. The seven story queen bee mill was closed in 1883, just two years after opening. Waterfall overlooks the cafe on the East Bank of the river. It's a quartzite structure that used to be a lighting and power company building and now offers family friendly fare and historical project displays.

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45. Richmond, Virginia, is about two hours' drive from Washington, D.C. Richmond is a bustling and quaint modern convenience site that blends civil war and liberation traditions. There is no shortage of family activities in the city - museums, ballet companies, opera houses, galleries, theatres and symphony orchestras provide cultural benefits. The city is also proud of the largest river park system in the United States. Frommer listed Richmond as the world's top tourist destination in 2014, claiming that "Richmond is becoming a regional tourist destination with more and more wineries, with restaurants from farms to dinner tables and even Whitewater jet activities directly running through the city center. "The city is the only one with the white water jet of the James River winding through the city centre. White water is an adventurous way to visit Richmond while enjoying wildlife such as deer, Condor, Osprey and Heron.

related: learn more about visiting Richmond, Virginia.

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45. The biedenhahn Museum and garden in Monroe, Louisiana, preserves the legacy of Joseph biedenhahn, the first Coca Cola bottler. For just 5 cents, you can buy a bottle of coke and a lot of Coca Cola Bottle ingredients. You can also view a series of Coca Cola cultural relics, visit bedenhan's home, and stroll in the European garden behind your home. For those who hear the call of wildlife, please stop at Heihekou Lake National Wildlife Reserve. " The 4500 acre spectacular lake, swamp, lowland hardwood, mixed pine and hardwood highland "is home to a variety of animal and plant species, including alligators, turtles, coyotes and poultry, according to Monroe westermonroe's website. You can rent a canoe to row along the 1600 acre lakeside, where you can read the aquarium and botanical garden carefully.

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41. Lincoln, the capital of Nebraska, is the perfect fusion of American Southern culture and globalization. Since the 1980s, it has been a place for refugees, with rich Iraqi, Vietnamese and Sudanese communities. Nebraska capital building is the second largest building in the United States, with 15 floors. Visitors can visit the sunken garden and display more than 30000 newly designed flowers every year. You can also take a walk around the University of Nebraska campus, where you can go to a museum or att to end a "corn man" sports event.

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41. Lafayette, Louisiana, is "the heart of cajin," according to the Louisiana travel website. Look at the village of Arcadia, a 32 acre replica of the town of Cajun in 1800, with even a bay running through it. Seven of the 11 buildings in the village are authentic houses donated by families whose ancestors once lived, according to the website of Arcadia village. The Louisiana orphan train museum commemorates the orphan train driver in nearby opellus, who went from the New York baby hospital to 1873-1929. In 2013, Lafayette was named America's best food town by Rand McNally / America's best road rally today. It is the food of Cajun and Creole, the world capital, where family cooking is influenced by France, Spain, the United States, Native Americans and Africa. For two food filled trips, please click the relevant link below.

related: Lafayette, Louisiana - best food town

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41. Lacross, Wis

last year, lacross was selected as the best small start-up city of nerdwallet. Like most of the United States, lacross recently saw a sharp decline in manufacturing, the article points out. However, the city has made up for its losses in "highly skilled, knowledge intensive industries, such as health care", with the highest proportion of enterprises with paid employees in all the cities analyzed. For new visitors, be sure to stop at the edge of the grand cliff, a 600 foot cliff overlooking the city.

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41. Hartford, Connecticut, was founded nearly 400 years ago. Hartford is one of the oldest cities in the United States. Mark Twain, the great American novelist and humorist, once said, "in all beautiful towns, my wealth is to see Hartford as the chief." It's not hard to imagine a young Tom Sawyer or Huckleberry Finn mold. On a river in the Midwest - in fact, Twain called Hartford his home between 1874 and 1891, and wrote the adventures of Tom Sawyer and Huckleberry Finn in a 19 room Victorian Gothic house. The house is now a historic site to visit. After visiting Mark Twain's home, head to Elizabeth Park to see the carefully manicured garden with 800 kinds of roses.

related: learn more about visiting Hartford, Conn.

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39. Virginia Beach Boardwalk in Virginia Beach is a popular East Coast destination, stretching for three miles, which is very suitable for walking, cycling and roller skating. In the summer months, you can find nightly live entertainment on one of four seaside stages. King Neptune, a 24 foot, 12 ton bronze statue dominates the gateway to Neptune Festival Park on 31st Street. In winter, visitors can watch humpback whales on board. Portland, Maine

Portland is the largest city in Maine, with the same name as Portland, Oregon. Tourists like to peruse the old port, a walking friendly area with many boutiques, restaurants and bars. European style blocks feature cobblestone streets and hundreds of years old brick houses, according to business insider. Portland is a great food destination. There are several famous restaurants here, including central restaurants, which won the James Beard Foundation's best new restaurant award in 2015, and Sam Hayward's forestreet, which won the James Beard best chef award in 2011. Visitors can also visit the Portland public market, a huge indoor market offering locally produced fares.

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35. Spokane, Washington state, was named after the first Native American to live in the area. According to Spokane's website, the name means "children of the sun" in Mount Sally. Although Spokane is the second largest city in Washington, it has many beautiful outdoor attractions. Spokane falls is the second largest city waterfall in the United States. Visitors can watch it from bridges and other viewing points. In manito Park, visitors can stroll through the carefully planned gardens, including the memorial garden of Nishikawa, Duncan garden, Lilac Garden and rose mountain garden. The University of Gonzaga is a liberal arts college in Spokane, which trains more than 7000 students every year.

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35. Pocatello, Idaho

Pocatello borders on the Fort Hall Indian reservation in Idaho. Although the first European colony was established there in 1834, it was not until 1860 that gold attracted settlers that the population of the city experienced a slight increase. One of the city's most popular attractions is very unusual - the cleaning museum shows everything about cleaning: vacuum cleaners, toilets, washing machines, brooms and so on. The museum has no guards, so it is very popular with children. According to their website, the museum's mission is "to extend the scope of cleanliness to clean families, clean ideas, clean languages, clean communities and a clean world."

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35. Lake Charles, Louisiana is a melting pot of Native American, Cajun, Creole, German and French culture. You can visit the historic district of shapentier, where the various towers, towers, gables, tiles, lead glass and gingerbread accents of the buildings reflect the diversity of the carpenter architects who built them. Download the Charles Lake history tourism app and experience the tour guide service. The city's Carnival Museum hosts the largest carnival costume exhibition in the south. In Louisiana, all kinds of gambling are legal, so casinos are the hot spot of night life.

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35. Oklahore, Wisconsin, comes from the original French name, oksler, which means "clear water". It is located at the confluence of the oxclair and chipewa rivers, where there are many sawmills, so it is nicknamed "sawdust city". Oakley is home to several apple orchards, including Ferguson's, where visitors can ride horse drawn carriages, ride tractors, visit farm animals, and ride a giant spinning apple.

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31. Springfield, mass.

Springfield gets its name here -- rivers and dense green plants spring up in western Massachusetts. Springfield is located on the East Bank of the Connecticut River, close to the junction of the Westfield, Chicopee and mill rivers, and is full of important outdoor beauty and activities. Visit the forest park's hiking trails, water parks, tennis courts, picnic areas and ponds filled with ducks, geese and other birds. Or, beforeHead to Pioneer Valley riverside club and start a boat or dragon boat ride along the Connecticut River.

related: learn more about visiting Springfield, Massachusetts.

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31. Seattle, Washington state is the largest city in the Pacific Northwest. The undulating coastal air of Seattle has the reputation of foggy and drizzle. However, due to its mild marine climate, both tourists and residents can enjoy outdoor activities for most of the year. Have a cup of coffee at the original Starbucks, enjoy a panoramic view of the city's evergreen forest on the Seattle liner, or navigate the Puget Sound.

related: learn more about visiting Seattle, Washington.

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31. Sagino, Michigan

sagino, in cooperation with its sister city, Tokushima, Japan, invited famous architect Tsutomu Takenaka to build a traditional tea house in the Japanese cultural center of sagino. According to Saginaw, teahouses provide an environment for chanoyu to promote harmony, respect and tranquility. Visitors can visit the centre's three acre garden and enjoy the details on its website: "weeping cherry trees, authentic stone lights, hand-made bamboo doors, Asian style terraces and arched cinnabar bridges on winding streams." The sargino river bank is also a popular destination. Once a year, locals gather to take part in the "shivering on the river" ice fishing competition. When you're nearby, stop at the shiawassee National Wildlife Refuge, one of Michigan's largest wetland ecosystems.

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31. Alexandria, Louisiana is located in the geographical center of Louisiana. In the 17th and 18th centuries, the city was an agricultural center. Ken special garden is the oldest building in Louisiana. Visitors can visit Alexandria zoo, where there are more than 500 kinds of animals, including white tigers, black bears, African lions and giant tortoises. The Alexandria Holocaust Memorial was built to commemorate the six million Jews who died in the Holocaust, and it is also an amazing sight. The 15 ton, 18 foot Obelisk has "almost mystical significance" in Jewish tradition, according to Alexandria Pineville, Louisiana. Rochester, New York is near the Canadian border and Niagara Falls on Lake Ontario. Its rich natural beauty and fresh air offer numerous opportunities for outdoor enjoyment, as do 12000 acres of parks, 100 miles of hiking trails, 45 miles of cycling facilities and waterways from the ginasi River to the Erie Canal. Cyclists from all over the world flock to Rochester to enjoy a leisurely ride along the lakeside promenade and organize cycling competitions. You can also enjoy outdoor activities at seabreeze amusement park, a family friendly destination on a beautiful cliff overlooking Lake Ontario with a classic wooden carousel, roller coaster, children's slide and water park.

related: learn more about visiting Rochester, New York.

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28. Portland, Oregon, is known as the "city of roses" because of its rose friendly climate. Portland is recognized as one of the most environmentally conscious cities in the United States because of its efficient public transportation. Located on both sides of the Willamette and Columbia rivers in the foothills of the tullatin mountains, it offers a wide range of options for exploring the Pacific Northwest, from hiking and swimming at onetta falls to mountain biking in a forest park. 28 years old. Greenville, NC

"Greenville is recognized as the cultural, educational, economic and medical center of eastern North Carolina," Greenville travel website reported. Located along the thar River, Greenville offers many outdoor activities, such as boating, kayaking, fishing, hiking, camping and bird watching. If you like agricultural tourism, you can go to breeley's farmer's market or Brock's Berry and farm. If you're looking for adventure, check out the full size motorway of the Black Jack MX.

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26. Lynchburg, Va., is located on the eastern foot of the Blue Ridge Mountains, along the James River. The 139 level Memorial terrace pays tribute to the citizens who fought and died in the civil war, the Spanish American war, the first and second world wars, the Korean and Vietnam wars. The sculptured steps lead to the Lynchburg Museum of the old court. A variety of outdoor enthusiasts can find an enjoyable destination in Lynchburg - from the Beaver Creek canoe rental to the Bedford wine trail.

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26. Charlottesville, Virginia is home to two UNESCO World Heritage Sites thanks to Thomas Jefferson: his home, Monticello, and the University of Virginia. The third president of the United States once described architecture as his "pleasure," designing the federal city of Washington, D.C., before making plans for the original sites of Monticello and the University of Virginia. He built the grand rotunda of the University in imitation of the Roman pantheon. Yuma, Arizona, has a wealth of Native American cultural sites, including places where you can go to see rock paintings, which are scratched, carved or pecked into rocks. Antelope mountain, a 575 foot sandstone hill, shows many, mostly human images. The painted rock contains about 800 images, including "concentric spirals often found at Hohokam site," the visit to Yuma reported. Fans of HBO's "western world" will love the castle dome Museum, a ghost town in the west at the end of the 18th century. It used to be a mining city with more than 300 mines in the castle dome area. However, when the price of silver fell in 1979, people began to waste. Visitors can stop at Carmelita's cantina, mercantile, machine shop, doctor's office and cemetery.

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24. Houma, Louisiana, is located in the heart of deep valley country, according to the Louisiana tourism website. More than 65% of the terebonne parish consists of wetlands and open water. " The ship docked atThe scene in front of the captain's house is as common as a family van parked in front of other American families. This is an area with unique cultural heritage. Houma Indians used to live in the area, but their population declined as the land between Spanish, French and American colonists changed hands. According to Houma tourism website, although there are still a few tribal members living in the coastal areas, "the federal government's non recognition, hurricanes and coastal erosion continue to threaten their survival". Visit the links below to learn more about nature therapist's traitorous tradition, the destruction of the last Island, the legend of the ruble werewolf and voodoo.

correlation: Houma travel: history and legend

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22. Pittsfield, Massachusetts, which was hailed as "Brooklyn of Berkshire" by the financial times in 2010, is making a comeback after years of industrial recession. It's a fashionable city village with all kinds of conveniences - neighborhood markets, yoga studios, live theatres, bustling cafes, "developer George whaling told the financial times. Visitors can visit the colonial theater designed by JB mcelfatrick, who designed hundreds of American theatres. Literary lovers can visit Herman Melville's home arrowhead between 1850 and 1862, where he wrote Moby Dick and other works. To get a quiet destination, visit Hancock shack village, which commemorates one of the 19 shack communities that sprouted in the United States at the end of the 17th century.

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22. Albany, the capital of New York State, is located on the West Bank of the Hudson River, north of New York City and south of Montreal. Like several East Coast cities, Albany's history predates the constitution of the United States. Settled in 1614, it became the capital of New York City in 1797. The city is one of the oldest settlements in 13 colonies. It is also one of the first cities in the world to install sewers, electricity and natural gas systems. As Albany is equidistant between New York and Montreal, some international activities make the small city more elegant when traveling. These performances often visit the iconic sculpture egg center, the Empire square performing arts center. After taking part in Albany's cultural attractions, go outdoors to enjoy the rich cycling lanes along the Erie Canal or lake Grafton State Park.

related: learn more about visiting Albany, New York.

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19. Rochester, Minnesota

in 2015, livability.com named Rochester the most livable city in the United States, "based on a and urban housing, economy, facilities, infrastructure, demography, social and civil capital, education and health care. Rochester is the location of the Mayo Clinic, which is "the first and largest non-profit group medical institution in the world," according to the Rochester travel website. Over the next 20 years, Mayo Clinic will develop a destination medical center, which will create 40000 new jobs and 100000 new residents, according to livability.com. Because of the Mayo Clinic, Rochester is rapidly becoming a major economic and cultural center, making it a good place for tourists.

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19. The name of Grande Island, Nebraska, comes from a large island in France, which is located on the Platte River and lagrand island. Some of the first European settlers were German, so German was used in the first schools and churches and published in the first newspapers. In 1850, the golden rumor in Colorado led to a population explosion. From March to April, there is another population explosion every year - a surge in birds. In other words, "pointy tailed grouse and prairie chickens gather at the annual breeding ceremony of the leks," reported a visit to the big island website. If you're in town, it's an event you don't want to miss.

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19. Duluth port, Minnesota, is the largest and busiest port in the Great Lakes region, according to its website. According to the website, the port "handles an average of 38 million short tons of cargo and nearly 1000 ships a year". With 6834 acres of city parks, 178 miles of tree lined trails and 16 designated trout streams, the town is a great destination for outdoor enthusiasts. Take a look at the 7.3-mile rose garden by lake Duluth or at lefevererson park. Art lovers will love the waterfront sculpture walk, where sculptures from Duluth and its sister cities, wacko, Sweden, Thunder Bay, Ontario, paltro zawatsk, Russia, and daihara, Japan decorate your path.

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18. Sierra Vista, Arizona is the hummingbird capital, and birders flock to Ramsey Canyon reserve. When exploring the 380 acre area, visitors will encounter three different hummingbirds (majestic, blue throated and white eared), two fly catchers and red hair. You may also meet a white nosed grass man, a small mammal that looks like a lemur and anteater hybrid. For history lovers, there is a 12 foot long Berlin Wall in the huachukaburg Museum and ancillary buildings. Visitors can also visit one of several ghost towns scattered throughout the region to see the Wild West: milville, Charleston, Fairbank and presidio, Santa Cruz de Trent. Anchorage, Alaska's must see destination is not what you think it is: the Alaska Railroad. "Traveling by train ensures that the journey is as spectacular as the destination," the anchorage travel website reported. From anchorage to Fairbanks, stroll freely between cars and enjoy the charming scenery of Denali State Park. Be sure to integrate the Kenai Peninsula, just south of anchorage, into your journey. It's 90% wilderness and a tourist attraction. Keep your eyes peeled because black or brown bears can be seen from inside your car or raft. In addition, Keai National Wildlife Reserve "is a sanctuary including about the third Peninsula, providing an ideal shelter for elk, lynx, wolf, Dall sheep, reindeer, fox, coyote, etc." according to Keai - halfIsland website.

Credit: 13. Wilmington, NC

Wilmington is located between the Cape Verde River and the Atlantic Ocean. The Carolina beach, Kurt beach, and lightsville beach communities are just a few minutes from downtown. Visitors can stroll to various barrier islands far from the city coast. In 2014, readers of USA Today rated the Wilmington river bank as the best in the United States. Boutiques, cafes and nightlife 1.8 miles of riverway. On New Year's Eve, visitors can watch beach dances and fireworks.

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13. Syracuse, New York

> breathe the fresh air of Syracuse in onddaga Lake Park, which is the perfect family place for outdoor leisure day. There, you can do anything from roller skating in summer to cross-country skiing in winter, along the road without vehicles. Art lovers will love the Iverson Museum, which, according to its website, "is the first museum dedicated to collecting American art." According to the snow city travel website, the building was designed by I.M. Pei, "who later designed the Rock Hall of fame and Museum in Cleveland, the National Gallery in Washington, D.C., and new buildings in the Louvre in Paris." For more Americans, visit the Erie Canal Museum, which shows the role of the Erie Canal in American history. In Lapid, South Dakota, 3 million people visit Mount Rushmore in Lapid every year. It took the workers 14 years to carve the portraits of George Washington, Thomas Jefferson, Theodore Roosevelt and Abraham Lincoln on the side of Montenegro. Montenegro is the holy land of lakotasu people. Although the U.S. government's otolaryngology department promised to include the lands of the Sioux in Montenegro in a treaty of 1868, when it found gold there, it changed its mind and forced the Sioux to give up the lands.

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13. Bangor, Maine, was the first sawmill in 1772. By the mid-1830's, more than 300 sawmills were located throughout the city. Loggers transport logs from northern Maine to the lower Penobscot River to receive them in Bangor. One place that can't be missed by wood lovers is the 31 foot tall statue of Paul bonyon in the city, which stands above bath park. This friendly and colorful statue is known as the largest statue in the world, even described by Stephen King in his novel it. Burlington, Vermont

as early as 2010, Burlington was rated as one of the most beautiful towns in the United States by Forbes for its charming "brick pedestrian market, Vermont's iconic white minaret and rolling hills, extending to a vibrant green waterfront in Lake Champlain". The Champlain islands provide 200 miles of coastline for people who enjoy outdoor activities. South hero island is the site of Vermont's first vineyard snow Farm Winery, where visitors can visit the Champlain Lake coastal wine trail.

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11. Albuquerque is the hometown of the University of New Mexico. Albuquerque is the original stop of line 66 and the hometown of Rio Grande. The climate is dry and desert. During the day, you can feel the heat and scenery by climbing on the Sandia mountain, or by walking in the woods in the moonlight after sunset. A great time to visit the annual Albuquerque International Balloon Carnival in October, when hundreds of bright balloons were launched from the balloon Carnival park. Learn more about visiting Albuquerque, New Mexico.

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H3> 10. Fargo, North Dakota

you may have heard of Fargo because of the Emmy award-winning TV program of the same name, but the city is far more meaningful than what you see on the screen. Founded in 1871, the company is named after William g. Fargo, co-founder of Wells Fargo express company. In its early days, Fargo was a rugged railroad town, full of brothels and bars. Cheap, fertile farmland in the Red River Basin attracted settlers, and by 1892 the city had a population of more than 8000. Today, there are more than 149700 people living in the fago murhead metropolitan area. Tourists can take photos with the woodcutter in the original version of the Coen Brothers movie. The Pioneer Village of bonanzaville is a collection of historical buildings from all over the county, including the Eugene Dahl Automobile Museum, tractor Museum, law enforcement Museum and Eagle Aviation Museum.

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9. Reading, California

between Sacramento and the California Oregon border, reading provides a rich and beautiful landscape. Castle cliff National Park is named after the 6, 000 foot Sacramento River with its awe inspiring, snow capped cliff tower. The park has 28 miles of hiking trails and 76 developed campgrounds. Visitors can also visit Shasta Lake Cave, a limestone cave that can be reached by boat through Shasta lake. Environmental awareness sundial bridge is "intentionally built, there is no river bottom, so that salmon spawning habitat is not disturbed," a visit to reading reported. The glass deck pedestrian bridge designed by Santiago Calatrava is more than 217 meters high. Salinas, California, is famous for being the home of Nobel laureate John Steinbeck. Now visitors can visit the Steinbeck Center Museum at his childhood home. According to the Monterey County Historical Society, the Salinas area was originally inhabited by costanoan or Ohlone Indians and named after the nearby salt marshes. According to Salinas's website, the city's agricultural industry began to grow in the mid-19th century and now supplies 80% of the country's lettuce and artichokes. In Elmira, New York, Dr. Edwin Eldridge originally designed the Victorian style Eldridge park so his patients could have a place to exercise in 1879. It features gorgeous gardens, picturesque statues and ponds. In 1924, Bob Lang joined the Looff carousel and turned Eldridge into an amusement park. Now, families can enjoy many attractions, including flying Thunderbird, mini golf course and boating. Bookworms can go to Mark Twain's shelterSummer villa, quarry, where famous writers wrote "Huckleberry Finn", "Adventures of Tom Sawyer" and other popular American classics. According to NPR, his writing space has several cat doors.

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6. Bismarck, North Dakota is the capital of North Dakota. Before Europeans settled in the 19th century, the Mandan Indians lived in the area for hundreds of years. The Shuanggou Indian village held 2000 people at its peak, according to the website discover bismarckmand. Now, there is only one footprint left in the global village. The Mandan ancestors lived in most of the northern Great Plains, according to the North Dakota Historical Society website. Their tribal headquarters are located on the fort Bertaud reservation in North Dakota.

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5. Honolulu is the largest capital of Hawaii. According to the National Park Service, visit the Pacific National Monument to the USS Arizona Memorial in the World War II valor to learn about "one of the most critical moments in American history": the Pearl Harbor attack that led the United States into the Second World War. More than 2000 American soldiers and sailors were killed in the attack, and more than 127000 American citizens of Japanese origin were forced into detention camps because of Anti Japanese bigotry and racism. Visitors should also stop at the Diamond Head State Monument, a landmark building with amazing coastal scenery and challenging hiking routes. Hike to the top of the mountain to see a huge saucer shaped crater formed about 300000 years ago when the volcano erupted. Finally, be sure to visit the beautiful beach in Waikiki.

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4. Kahuli, Hawaii, is the commercial and industrial center of Maui. Every year, 2 million tourists from all over the world go to the nearby lahina. In 1802, King Kamehameha unified the Hawaiian Islands under his rule, making lahina the capital of the Hawaiian Kingdom. It remained in this state for more than 50 years before moving permanently to Honolulu. Visitors will not miss the banyan, a non-native tree planted in 1873, which is now more than 60 feet tall and has 16 main trunks spanning more than 200 feet. In the west, try snorkeling or diving. Be sure to avoid sunscreen containing benzophenone oxide, a chemical that can damage coral reefs. Finally, visit Haleakala National Park, a sacred place for Hawaiian natives, famous for its volcanic landscape and subtropical rainforests. At the beginning of the 20th century, the booming oil and refining economy attracted thousands of workers and their families to Casper, Wyoming. Between 1910 and 1920, the city's population increased from 2639 to 11447. Since then, the population has declined with the rise of oil prices. Now, refineries are either closed or much smaller. Casper is the second largest city in Wyoming, with a more diversified economic form. It is "the retail, medical and energy industry service center in the surrounding areas and most parts of Wyoming". Casper hill is a popular tourist attraction just minutes from the city center. Outdoor enthusiasts can hike, camp and ski. Hunters will find plenty of antelopes, deer, elk, pheasant and ducks, while fishermen will be able to relax along the North Platte River. As the capital of Wyoming, Wyoming's Cheyenne "embodies the spirit of the old West." According to the Cheyenne travel website, "it is also considered to be the rodeo and rail capital of the United States." The 30000 acre Terry bison ranch is a must see. During the train bison tour, you can enjoy more than 2300 bison grazing. Cheyenne railway station is one of the most beautiful railway stations in North America, "one of the last large railway stations left behind by the transcontinental railway in the 19th century," the travel website said. Visit the museum there to learn more. Looking forward to the future, Paul Smith children's village of Cheyenne botanical garden shows sustainable systems in energy production, water quality, food production, etc. Farmington, New Mexico

> Farmington, New Mexico leads the United States with the cleanest air, don't miss the bisti / de Na Zin wilderness. According to wilderness.com, a strange sense of otherness surrounds the tavern wilderness, especially when the moon casts shadows on weird rocks with labyrinthine passages. This strange landscape once inhabited an ancient ocean, full of prehistoric creatures. There are also some national parks with cultural significance to see. The Aztec National Monument allows visitors to explore Pueblo's 11th century buildings. Chaco Culture National Historical Park, also known as Chaco Canyon, "is the largest excavated prehistoric site in North America, and Mesa Verde National Park has many cliff like dwellings, famington.com reported.

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What do you think? Is your city listed? Are you surprised at the result? Have you ever been to one of these cities, or are you going to go after reading the list? Which city would you like to participate in most? Please let us know in the comments!

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