Spain's unique Mosque-Cathedral has been a place of worship for both Muslims and Christians throughout its history.

A curious carving hides on a marble column in the Mosque-Cathedral of Córdoba.

This vast masterpiece of Moroccan architecture spreads across 20 acres.

Fortune tellers, snake charmers, poets, and storytellers all gather on this historic square in Morocco.

A bright little alley in La Boca is a part of tango history.

Constructed on the ruins of a convent, this tower saved countless lives.

Hot springs monkey spa in the middle of Hell's Valley.

These pastel-colored homes were built when the island of Macau was a Portuguese colony.

This statue once earned the distinction as one of the "Three Major Disappointments of the World."

The headquarters of the Mahanikai school of Buddhism, Thailand's largest monastic order.

A shrine built to combat the bad karma of a commercial venture.

This museum has a most unusual location: inside a giant, three-headed elephant.

Though it was originally dedicated to the Hindu god Shiva, Baphuon was converted to a Buddhist temple in the 15th century, complete with a massive hidden statue.

A battle between nature and architecture in the Cambodian jungle.

Bombed and burned, this monument represents the often controversial ties between Vietnam and Cambodia.

Originally a meeting place for foreign correspondents and war reporters, the FCC remains an atmospheric spot for sunset drinks in Phnom Penh.

Khmer Rouge's high security prison.

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

A castle built for love, and abandoned due to heartbreak.

This sculpture was made in 1973 for the city's 300th-anniversary celebrations and was largely considered an eyesore at the time.

Bangkok celebrated its shifting monarchy with a militaristic homage to democracy.

This dazzling Buddhist temple was constructed from over one million ceramic tiles salvaged from a British shipwreck.

A limestone wonderland of water and subterranean secrets.

This bridge made famous in a novel and on-screen wasn't actually built over the river Kwai.