The World's Deepest Sinkhole

The Xiaozhai Tiankeng (小寨天坑), also known as the “Heavenly Pit”, is the world’s deepest sinkhole.

Located in Fenglie County of Chongqing Municipality in China, the sinkhole measures 2054 feet long, 1762 feet wide, and 2172 feet deep. To give you some perspective, you could stack Seattle’s Space Needle on top of the Empire State Building (including the antennae), and it would still be over a hundred feet below the surface. It's so huge it has its own ecosystem, and scientists have identified more than 1,285 plants and animals living in the sinkhole. There are even some clouded leopards that have been spotted prowling about in the trees at the bottom.