Dian Kingdom, China
Fuxian Lake in Yunnan Province is a mysterious lake which hides an ancient city in its depths. The locals told they could see a city-like silhouette under the lake from the nearby mountains on a fine and calm day.
In 2001, a team of archeological researchers discovered a large collection of buildings, including eight pyramid-like structures and many artifacts. They are believed to be a part of the ancient Dian Kingdom submerged about 2,000 years ago.