This remote Himalayan temple is in danger of being completely washed away by a melting glacier.

This giant underground cave chamber can only be accessed through a small opening at the top.

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

This abandoned fort is said to be the most haunted place in India, so much so that entry is prohibited after sunset.

Once an indicator of social class, the color blue has come to define this city on the edge of the Thar Desert.

Sacred Indian temple that’s all monkey business.

More than half of this Indian palace is drowned but it looks all the more spectacular for it.

Thousands of exquisitely carved stone water storage wells, hundreds of stone steps fill this exquisite medieval stepwell.

Buddhist monk remarkably preserved because he started the mummification process while still living.

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

The highest monastery in the world operates a tiny guesthouse with doors open to all.

Ancient rock-hewn town that witnessed key events of Georgian history.

This neon lit Georgian cave claims to hold the boulder Prometheus was chained to.

The second largest in the world, this massive underground void has its own subway.

One of the largest necropolises in the world is home to a stunning array of historic Middle Eastern tombs.

Reputedly haunted sandstone necropolis with exquisite stone carvings.

The third largest ship breaking yard in the world has created an eerie shipping graveyard in southern Pakistan.

Lunar landscape, a mud volcano and bizarre rock formations.

Hydraulic systems in an ancient underground Iranian city.

This circular Iranian jail was once a political prison run by the country's secret police.

This vast, water-filled underground labyrinth can only be toured by boat.

Salt cured mummies continue to turn up in this Iranian mine.

In this tiny Iranian town playing on the roof isn't just encouraged, it's the only place to go.

This museum preserves the hand-dug tunnel that kept Sarajevo afloat during the Serbian siege.