Monasteries on rock pillars, once accessible only by frayed ropes.

A battle between nature and architecture in the Cambodian jungle.

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.

An enormous Buddha peers through a gap in its ruined chamber.

Cavemen, elephants, and eagles greet passengers driving through the town's main intersection.

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

A mile-long navigable cave adorned with stalactites and stalagmites reaching up to 65 feet tall.

Buddha shrines hide within dark tunnels at this unique forest temple.

Bizarre dirt trail winds a narrow path above the tree line.

Monkeys lounge around at this 13th century temple.

A modern temple with an ancient philosophy.

A limestone wonderland of water and subterranean secrets.

Elaborate tile work in this railway station tells the story of Portugal.

Hidden beneath a beautiful overlook you’ll find the history of the city depicted in comic strip format next to a pay toilet.

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

This unreal Portuguese palace looks as though it's made from a pile of different castles.

One of the most beautiful bookstores in the world hides a neo-Gothic interior behind an art nouveau facade.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

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

For centuries young Thai men used this Giant Swing as a slingshot to heaven.

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

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

A treasure trove of pathological, forensic, parasitological, and anatomical specimens.