Rock-cut caves and 7,000 Buddhist sculptures carved into the nearly sheer face of a sandstone mountain.

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

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

Enormous burial mounds of ancient emperors.

A sacred mountaintop temple offers a fine cup of tea to visitors who can survive the journey.

The ruins of an Estonian prison are drowning in the quarry lake where the convicts were once forced to work.

A decommissioned submarine base makes a great space for graffiti art.

The quintessential Japanese rock garden has existed for more than 500 years.

The Yonaguni Monument, a natural formation or the Japanese Atlantis?

White beach sands made of the remains of tiny, star shaped creatures.

Cave where bat-eating snakes hang down from the ceiling.

A giant gun barrel in Barbados that once hoped to shoot outer space with science.

The hidden "ballroom" under a mansion lake was built by a criminal who ate a cyanide pill during his trial.

This natural French spring has been turned into a magical grotto by Roman and medieval constructions.

Filled with goldfish swimming in a shallow pool of sea water, this ancient crypt is more wishing well than burial site.

The shockingly unspoiled Peruvian tomb of the Lord of Sipan was once guarded by a footless warrior.

This was once the center of the Birdman cult, and is now a World Heritage Site.

A palatial sculpture park was built illegally and in secret by a self-taught artist over 36 years.

This hilltop warren of monastic dwellings is the result of centuries worth of Mongol attacks.

The self-mummified monks of Japan.

The vast chamber inside this abandoned cooling tower looks like something out of a sci-fi dystopia.

The abandoned Japanese amusement park once loomed as a dystopian Disneyland.

The Buddhist temples of Yamadera, built into a mountain side, feature a viewing deck with sweeping views.

The sound of swaying stalks in this stunning grove has been named a governmentally recognized sound.