Khmer Rouge's high security prison.

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

A battle between nature and architecture in the Cambodian jungle.

The largest tea plantation in Southeast Asia supplies gorgeous vistas alongside tea for the surrounding countries.

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

A church of bones, decorated with 40,000 human skeletons.

A colorful street named for the legendary Australian rock band.

A massive metal lobster welcomes tourists to a roadside restaurant.

The largest collection of Indigenous Australian artifacts in the world, and the rare museum where wood-and-glass cabinets have trumped interactive exhibits.

The once-dying town of Sheffield, Tasmania has reinvented itself as a village of painted wonders.

This controversial museum includes such detested exhibits as a chocolate suicide bomber and fecal-smelling digestion machine.

The UFO capital of Australia is the outback’s answer to Roswell.

Come for the flowers, stay for the bats!

Clusters of huge boulders in the Australian Outback.

Aqua white sand highlighted with fiery red rocks.

Nine limestone rock stacks on Australia's "Shipwreck Coast."

An opal mining town in the middle of Australia where people live, worship, and shop underground.

A clear example of the process of erosion in action.

Occult books, tarot, oddities.

A huge musical instrument played by the ocean.

A psychedelic labyrinth on the San Francisco bay.

Notorious artist squat renovated into legal studios.

Abandoned railway line circling the city of Paris.

France's most famous cemetery, with some of its most curious tombs.