A giant interactive periodic table with real samples of the elements.

A bus with a butt and biceps to put Olympic athletes to shame.

This artificial cave looks like something out of a fairytale.

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

Started as a kitchen garden, now the second largest botanical garden in the world.

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

An old department store turned Nazi prison turned artist commune.

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

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

A monument to the three wars that led to German unification towers within a Berlin traffic circle.

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

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

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

Berlin's old airport.

Super-heavy Nazi architectural experiment.

Germany's Glienicke Bridge has a shady history of clandestine meetings, espionage, and spycraft.