On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

Terrifying derelict military hospital once housed a recuperating Hitler.

An abandoned NSA listening post on Berlin's "Devil's Mountain."

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

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.

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

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

A battle between nature and architecture in the Cambodian jungle.

Khmer Rouge's high security prison.

Floating swimming pool within a moored vessel.

An eerie, derelict amusement park in Berlin.

Metro station with a claim to rock n' roll fame.

Berlin's old airport.

Where once there was a train station bathroom, there is now this German burger joint.

The most visited, and possibly most controversial, museum in Germany.

Cold war icon and onetime "hole" in the iron curtain.

An old department store turned Nazi prison turned artist commune.

A whimsical and twisted animatronic monster tour beneath the streets of Berlin.

The largest bell in the world has been swinging high above a Cologne cathedral for almost a century.

A church filled with the bones of hundreds of virgins martyrs—or so they say.

Thousands of tourists and residents in Cologne affix "love padlocks" on the Hohenzollernbrücke Bridge to symbolize their affections.

Largest illuminated advertisement sign in the world.