Climb atop one of the world's longest and heaviest trains for an unbelievable journey across the Sahara Desert.

This remarkably well-preserved mosque stands amid an 11th-century caravansary.

This colorful overpass is one of Bhutan's longest suspension bridges.

This penis-focused monastery is dedicated to Buddhism's "Divine Madman."

This Himalayan airport provides one of the most difficult landings in the world.

Strange, gentle beasts resembling goat-cow hybrids roam within this patch of forest.

This giant Buddha statue has 125,000 smaller Buddhas hidden inside it.

Khmer Rouge's high security prison.

5,000 skulls in memorial to those killed by the Khmer Rouge.

Huge stairway leads to this massive gallery.

An ancient fortified mound raised over the millennia from settlements built one on top of the other.

The unique funeral practices of the Toraja can be seen here with graves carved into caves and hung off cliffs.

Where cemeteries are carved into the side of cliffs and infants are buried in the hollows of trees.

Nailing a coin to this holy stump is just another way to ask the gods for relief from dental pain.

Sacred Buddhist home of some spiritual monkeys.

This historic square in Nepal is home to temples dating back to the third century.

A brick building in Kathmandu's Durbar Square is home to Nepal's most prominent living goddess.

One of the largest Buddhist stupas in the world keeps an eye out in every direction.

The oldest Hindu temple complex in Nepal serves as the seat of Nepal’s national deity, Lord Pashupatinath.

The courtyard of this palace was the site of the worst slaughter of sitting royals in recorded history.

Giant reed houses made in the marshes of Southern Iraq.

One of the largest cemeteries in the world.

Climb a steep hill in 90 seconds on the second-oldest urban subway in the world.

Skyscraper powered by wind turbines attached between its towers.