Hanging Temple of Hengshan, a 5th-century temple improbably built into the side of a cliff
The Hanging Temple, located about 60 km southwest of Datong, China in Shanxi province, is one of the world’s forgotten wonders. Clinging to a crag of Hengshan mountain, in apparent defiance of gravity, it consists of 40 rooms linked by a dizzying maze of passageways. The temple is said to have been built by a monk named Liao Ran during the late Northern Wei Dynasty (386-534 AD) and restored in 1900.
The temple was constructed by drilling holes into the cliffside into which the poles that hold up the temples are set. Interestingly the temple is dedicated to not just one religion, but three, with Confucianism, Taoism and Buddhism all practiced within the temple and represented in 78 statues and carvings throughout the temple.
The temple is located about 60 kilometers southwest of Datong.
Source: Atlas Obscura.