Even drowned in an ocean of toxic waste, the remnants of this Romanian village stand tall.

The Natural History Museum that time forgot.

This historic island prison holds one of the dungeons from the Count of Monte Cristo even though it is a work of fiction.

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

This Cambodian riverbed is covered in ancient Hindu carvings both above and below the waters.

This Czech military museum is home to pink tank that was once a symbol of art and political rebellion.

This collection of reclaimed landmines acts as both an exhibition of their deadly history and as a shelter for children affected by them.

Limestone caves in the Cambodian countryside, once the site of genocide, now a place of peaceful beauty.

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

A former French military respite turned jungle tourism hotspot.

A battle between nature and architecture in the Cambodian jungle.

Khmer Rouge's high security prison.

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

The mystery of the Putim Ossuary involves a tricorn hat.

Former headquarters of the KGB.

The world's first museum dedicated to the work of game-changing naturalist Charles Darwin.

This Russian locomotive museum was once devoted just to Lenin's funeral before expanding to encompass Moscow's entire train history.

This Prague museum collects brutalist relics and memories from the country's former Soviet rule.

The hidden lair of an alchemist rediscovered in a 2002 flood.

The history of occult science is turned into a creepshow at this lurid Prague tourist attraction.

Buried five stories underground, this Soviet bunker is packed with gas masks and Cold War paraphernalia.

Barcelona's historic 19th-century sewers, whose foundations were laid in medieval times, are open to the public for exploring.

This picturesque Umbrian city has a subterranean side that has long remained hidden.

A monument to Lenin has been transformed into a statue of everyone's favorite black-helmeted, fool-choking Sith Lord.