Famed as the world’s deepest sinkhole, the Xiaozhai Tiankeng in China’s Fengjie County is a naturally impressive sight. Although it did not form abruptly to devour any neighborhood, its colossal ...

The Xiaozhai Tiankeng sinkhole is vast. Probably formed centuries ago by collapsing caves and underground rivers, teams of explorers have sought to understand its many mysteries for years.