A small 12th-century temple surrounded by waters believed to have curative properties.

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.

Khmer Rouge's high security prison.

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

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

Artifacts and memories from the Vietnam war, located in a place that experienced it first hand.

Witnesses claim the Virgin Mary statue outside the church once mysteriously shed a single tear.

This historic spot was where America's involvement in the Vietnam War officially came to an end.

Enormous statue of the Emperor of the Mongols.

The monastery survived the Communist revolution in Mongolia as a religious museum.

A beloved tribute to the Fab Four and the freedoms they inspired.

A collection of old steam and diesel locomotives sitting in a fenced-off garden.

A huge communist-era propaganda monument and mural that offers stunning views of the Mongolian capital.

The world's largest wooden structure.

These wooden balconies that are both decorative and functional.

The largest salt farm in the Canary Islands is located at the foot of an active volcano.

This unique rock formation is quite the local celebrity, although one day it may come crashing down.

These sandstone replicas of a whale spine represent the history and culture of the Canary Islands.

This propeller hub is one of the last remnants of a ship that crashed off the coast of the Canary Islands.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

This stunning iron gate designed by Modernist architect Antoni Gaudí is filled with mythic symbolism.

An early 20th-century bullring converted into a modern shopping center.

These secluded and abandoned anti-aircraft defenses have become one the most scenic viewpoints in Barcelona.

The largest Art Nouveau complex in the world is a Barcelona hospital with a 600-year-long history.