Beijing's expansive subterranean hiding spot now crumbles away as a tourist destination.

This temple located on a vertical drop of a rocky mountain houses relics from the Song Dynasty.

This Cold War–era underground city includes offices for Mao Zedong and Lin Biao.

The largest traditional Chinese medicine market in the world sells ingredients that may make you squirm.

This top secret Chinese military megaproject is the world’s largest human-made tunnel structure.

A fantastic assortment of China's finest and most disturbing wares.

Comprised of thousands of cave temple carvings this cornucopia of ancient Chinese stone art is unrivaled anywhere in the world.

The largest radio telescope in the world searches for extraterrestrial life from the remote limestone peaks of southern China.

Hundreds of caves filled with thousands of centuries-old statues and murals.

Forgotten German bunkers in China create a sharp cultural contrast.

The field of tiny caves that mark this Chinese cliffside are each their own historic Buddhist temple.

The tiny statues form China's only known terracotta army from the Han dynasty.

A harrowing trail up a mile-high mountain.

Enormous burial mounds of ancient emperors.

Two ancient Buddhist temples crown this dramatic rocky pinnacle.

An collection of Chinese propaganda posters from 1949 to 1979.

Discovered after draining a local pond, these ancient man-made caves are still a complete mystery.

Rivers of cattle blood gone, a strange Escheresque building remains, the last of its kind.

A tunnel dug through the side of a mountain by hand provides convenient yet death-defying access to a small village in China.

A fifth-century temple improbably built into the side of a cliff.

This church is considered the largest and most complete Saxon church in England.

An early work of the architect Álvaro Siza Vieira, these swimming pools blend into the beach.

A submerged village appears when dam levels drop.

The walls of this small village have been turned into a living street art gallery.