A nightmare for the claustrophobic lies hidden in Southeast Asia.

Khmer Rouge's high security prison.

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

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

This French colonial post office is arguably the grandest in all of Southeast Asia.

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

Meant to be a lavish presidential home, the palace became a symbol of the fall of South Vietnam.

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

A memorial to the monk who set himself on fire to protest the persecution of Buddhists in Vietnam.

Nearly three tons of weapons from the Vietnam War still remain in this small, hidden museum.

This winding road through an Italian canyon may be the most scenic drive in the world.

The highest peak in Wales is said to be the final resting place of a giant killed by King Arthur.

A subterranean playground in an abandoned slate mine.

A miniature Italianate fantasy village on the coast of Wales and the set of ITC classic "The Prisoner."

A beautiful ruin of a 14th-century Plantagenet castle built by a medieval mercenary.

In 1943 the British military took control of this village, telling residents they had to leave temporarily. The villagers were never allowed to return.

A defensive structure built during the Hundred Years War has remained useful in one way or another for nearly 700 years.

Inspired by Thomas Stothard's painting of the "Journey to Canterbury," albeit with Canterbury natives.

A wonderfully eccentric Victorian-era museum and library.

Today, Kent's medieval monarchs hold court on a busy pedestrian thoroughfare—or at least their statues do.

This skewed English house has looked like it's going to fall over for centuries.

One of England's most famous churches hides a pair of little known architectural treasures.

The final resting place of England's most notorious bandit.

The little-known second castle that William the Conqueror built in York.