A tree-like building perches on its trunk in the Steglitz neighborhood of Berlin.

A museum dedicated to the history of a terrifying secret police is now held in their former headquarters.

This futuristic German spa allows visitors to float in a pool of salt water while zoning out to underwater techno.

A tour of underground Berlin takes you through WWII air raid shelters and tunnels used to smuggle people out of East Germany.

Visitors flock to the historic birthplace of radiobalneology for its therapeutic radium treatments.

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

Enormous sandstone towers loom within a Czech forest.

The world's greatest slide descends 18 stories from this looping mountaintop viewing platform.

Thirty creepy ghosts now inhabit this decaying 14th-century church.

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

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

A half-buried vehicle in Prague's is the latest iteration in a long-running piece by Czech artist David Černý.

Throughout this shopping mall are medieval ruins that were discovered during the mall's construction.

Bullet holes in the church wall are a reminder of the violence that followed the assassination of a high-ranking Nazi officer.

Looming communist pillar with a Czech twist.

A curious statue fit for a mad tea party.

An eerie, existential museum dedicated to the author of "The Metamorphosis."

Street artists transformed an abandoned air vent into the beloved Star Wars robot.

A bust of Franz Kafka spins in pieces, reflecting the writer's inner torment.

Art and a pun, all in one.

A crumbling bakery where forced laborers from the nearby concentration camp toiled to feed their fellow prisoners and Nazi soldiers.