The notorious "Hanoi Hilton" where Vietnamese colonial subjects and later American POWs, including John McCain, were imprisoned.

This Vietnamese hell cave lets visitors take a walk through a devilish underworld full of demons.

An extravagant monument to an extravagantly unpopular Emperor.

This spectacular bridge supported by two gigantic hands looks like something out of a fantasy universe.

Vietnam's feral abandoned water park offers access to a post-apocalyptic funscape, now with fewer crocodiles.

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

One of the biggest markets in Asia, under one of the continent's largest domes.

The capital of Cambodia is named after the hill on which this ancient temple complex stands.

Take a hidden path to the mouth of the cave to watch millions of bats swarm at sunset.

A quick and simple solution to Cambodia's train woes.

Limestone caves in the Cambodian countryside, once the site of genocide, now a place of peaceful beauty.

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

A battle between nature and architecture in the Cambodian jungle.

The only royal palace on U.S. soil has been a territorial capitol, a military headquarters, and a prison for a queen.

Race through the maze, get your name on the sign.

An oddly touching memorial to a little-remembered nuclear tragedy.

A small island with no monkeys but plenty of military ruins.

An ingenious solution to a tricky engineering problem, this spiraling bridge takes drivers for a dizzying spin.

This giant seated Bhudda of Healing dates to the 1780s.

This sawtooth mountain range still bears the strangely lovely marks of its history as a medieval quarry.

Meet the world's longest tapeworm in a collection that really gets under your skin.

Shrine to Japanese water-goblins, complete with their preserved body parts.

The world’s tallest outdoor lift stretches along the stone pillars that inspired the floating mountains in the movie “Avatar.”

Hundreds of caves filled with thousands of centuries-old statues and murals.