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.

Abandoned soda factory on a Cambodian roadside in a state of beautiful decay.

An abandoned Cambodian resort that mirrored the downfall of the country as it was happening.

A gruesome memorial for those lost in this area during the Khmer Rouge genocide.

This impressive clifftop temple was once at the center of an international custody dispute.

More than 100 Hindu temples are slowly being swallowed by the forest.

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

Hoax, mistake, or evidence of dinosaurs in human times?

A former French military respite turned jungle tourism hotspot.

Apparently, Hell has waterfalls in Slovenia.

This was the second largest mercury mine in the world and one of the oldest preserved mine complexes in Europe.

A crumbling World War I fort that is reached through a series of concrete tunnels.

This abandoned Slovenian military barracks has become a punky-political art squat.

A miniature train-ride through Slovenia's largest cave system.

Castle and secret tunnel withstood a siege until its owner was killed by the Holy Roman Empire, while sitting on the toilet.

Tall columns of volcanic basalt make up this improbable-seeming rock formation.

A cheeky reminder about the value of art dangles above one of Olomouc's busiest streets.

The soulless eyes of 82 bronze children stare on forever in remembrance of a horrifying World War II massacre.

This unusually shaped mountaintop tower looks like a UFO floating over the city.

This walkway is so narrow it needs its own light to stop pedestrian traffic jams.

Folklore says this medieval fortress was plopped atop a portal to hell to trap the demons below.

Bohemian paradise covered in majestic forests.

What looks like a crashed Zeppelin is actually a bright, airy reading room perched atop a modern museum.