4. Taj Mahal, India

An ornate mausoleum of white marble, The Taj Mahal is the sparkling jewel of Muslim art in India. Built in the 17th century by Emperor Shah Jahan as a memorial to his favorite wife, The Taj Mahal currently hosts 3 million visitors a year. India’s star attraction may be barring entry soon as heavy foot traffic, air pollution, and poor restoration have eroded the structures integrity both internally and externally. Until the magnificent structure is sound, the days of up-close encounters are numbered. If the Taj Mahal is a must see for you, you should travel soon. Pollution is gradually staining the stunning mausoleum a sickly yellow color.

5. Venice, Italy

Venice, an Italian city heralded as one of the most romantic places to visit in the world may soon go the way of Atlantis. Known for epic grandeur, seafood feasts and its beguiling network of watery canals, Venice has been sinking slowly for years. A steady increase in severe flooding year after year has scientists theorizing how long the city will remain above water. Some say it will be uninhabitable by the turn of the century.