A Surreal flight of architectural fancy in Vietnam's Central Highlands.

Khmer Rouge's high security prison.

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

A former French military respite turned jungle tourism hotspot.

Holy Hindu shrine in an enormous, monkey-filled limestone cavern.

An ancient iron pillar in Delhi that seems to be rustproof.

A blooming house of worship for the masses.

It's big, it's a ball, and it's made of twine—the world's largest of its kind.

In the St. Francois Mountains in the Ozarks at 1,772 feet above sea level, Taum Sauk Mountain is the highest (and possibly oldest) peak in Missouri.

Once one of the world's great cities, Cahokia was a place of religious worship, trade and mass human sacrifice before being mysteriously abandoned.

Equal parts record-breaking temple to consumerism and bizarre fun park, it's more than you think it is...

Explore the History & Technology of Electronic Communication

A museum dedicated to the exploring past, present, and future innovations.

A toweringly silly piece of modern art has been delighting locals since the 1980s.

The only arched bridge made of stone on the entire Mississippi River.