The Longyou Caves of China are not natural formations. They appear to have been carved out of the soft sandstone more than 2,200 years ago, during the Qin Dynasty, approximately 212 BCE. The cave system is impressively large…covering more than 320,000 square feet in twenty-four different caves. Some of the caves, in fact, are nearly 100 feet in height.
The caves are not simple holes in the ground. There are carved bridges, pillars, pools, and steps. Intriguingly, there are also carved symbols chiseled all around the caves, on the ceilings, pillars, and walls. The purpose of the cave system is unknown. And there is no textual evidence to the caves’ existence, who built them, and why.