The gorgeous entrances into the city's underbelly look more like grand halls than subway stops.

This building holds the embalmed remains of the leader of the Bolshevik Revolution.

Qatar's oldest market can trace its origins back more than a century.

Historic fortifications form the boundary of Vatican City, but it’s not entirely surrounded by walls.

The lavish temple of the Cao Dai religion that includes Buddha, Mohammed, Joan of Arc, and Victor Hugo.

One of Vietnam's most iconic landmarks was built by Japanese traders and is now in danger of sinking.

An extravagant monument to an extravagantly unpopular Emperor.

Giant pagoda houses the car that drove Thích Quảng Đức to his death by self-immolation.

Ho Chi Minh's perfectly preserved body has been on display here since 1975.

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

Home of the unusual art of water puppetry, one of Vietnam's oldest curiosities.

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.

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

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

Khmer Rouge's high security prison.

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

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

This bazaar is one of the oldest in the Arabian world.

This spectacular mosque houses the second-largest chandelier in the world.

This beautifully restored fortification kept the city safe for centuries.

When the USA donated cement and funds to expand the airport in Laos, the Laotians built a massive monument instead.

Thousands of effigies of Buddha watch from caves set high above a legendary river, plus whiskey.

One-of-a-kind stupa in Laos.