He Cheng & Shi Cheng

Two ancient Chinese cities were drowned when the valley was flooded for a new hydroelectric power station. He Cheng and Shi Cheng remained forgotten for 40 years until 2001. Shi Cheng was built more than 1300 years ago in 621 AD. It was once the center of politics, economics and culture. He Cheng is even older: established in 208 AD as a business hub.