A limestone wonderland of water and subterranean secrets.

An ancient jungle temple carved into a rocky overhang of the Dane Soung Plateau.

Beatlemania is still going strong... at least in Kazakhstan.

Extremely isolated Silk Road caravanserai in the middle of nowhere.

Sacred Buddhist home of some spiritual monkeys.

Miraculous vase predicts the future at this Tibetan Buddhist site in the Himalayas.

A city built from mud and known as the "Manhattan of the desert."

The small cliffside monastery known as the Tiger's Nest is said to be the meditation site of an eighth-century Buddhist master.

A fiery crater has been burning in the Karakum Desert since 1971.

A mud volcano in Indonesia spews out 50,000 cubic meters of mud every day.

Known as the wettest place on earth.

Centuries-old bridges grown from tangled roots.

Nazca pilgrimage site covering 370 acres is a popular stop for archeologists and looters.

Death road of Bolivia.

On the outskirts of a desert trading village high on the Andean plain, steel giants have been destroyed by salt winds.

Largest site of dinosaur footprints ever found includes more than 5,000 tracks.

A grand example of 19th century Burmese teak architecture, and the most significant of Mandalay's historic buildings.

This everlasting lightning storm may be the world's largest generator of ozone.

A Romanesque tower appears when water levels drop.

A take-out restaurant that only serves cuisine from countries with which the United States is in conflict.

Most-visited and most-photographed slot canyon in the American Southwest.

A natural arch offers panoramic views of Yangshuo's karst hills.

A seemingly endless landscape of pure salt stretches far across Bolivia.

This Tang Dynasty behemoth is the biggest Buddha in the world.