Home of the International Space Hall of Fame.

This enormous World War II relic is one of the largest wooden structures in the world.

A World War II torpedo launch station abandoned off the Polish coast.

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

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

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

This water-tower-turned-high-end-apartment building was once the site of an early Nazi concentration camp.

Berlin's natural history museum houses the world's largest mounted dinosaur and the late beloved polar bear Knut.

Berlin's beloved bear is immortalized at the Museum für Naturkunde.

The walls of Germany's Parliament still show the scars of the Red Army takeover in World War II.

A monument to the man who almost killed Hitler.

A slice of central Asia in the middle of Berlin.

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

A fascinating insight into daily life in the Eastern Bloc.

One of downtown Berlin's last reminders of its Communist past.

The largest free-standing aquarium in the world resides in a hotel lobby in Berlin.

Constantly maintained, this organ is playing a six-century long composition by John Cage.

This East German military command bunker was ready for World War III.

A Black Forest cuckoo clock theme park features one timepiece big enough to walk inside.

Every hour the doors open to reenact the legend of the heroic mayor who saved his town by drinking a gallon of wine.

This historic funicular system combines the old with the new while offering delightful views over the surrounding valley.

It's good luck to be mocked by this monkey.

A preserved college lock-up that recalls a clubhouse approach to discipline.

A collection of artworks exclusively created by the mentally ill that was almost burned by Nazi culture police.