10. Hashima Island, Japan

Hashima Island is just one out of more than 500 abandoned islands belonging to the Nagasaki Prefecture. The island remains a symbol of Japan’s industrialization, though it stains the country’s history with its forced slavery during World War 2. The 6.3-hectare island was home to one of the country’s undersea coal mines. Today, many of the buildings have been repaired, and the island has been opened up to the public and travelers.