A 12th-century fortress containing some of Berlin's oldest buildings.

This little museum is making sure that the art and history of the graffiti sticker is not scraped from history.

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

Super-heavy Nazi architectural experiment.

A fascinating insight into daily life in the Eastern Bloc.

A narrow passage next to a cafe leads to a courtyard exploding with murals, tags, and paste-ups.

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

The music is over at the Ballhaus Riviera Ballroom, but the ballroom remains in haunting disrepair.

The 1936 Summer Olympics site is a crumbling remnant of sportsmanship and a history its host country would like to forget.

A state-of-the-art medical facility from the Imperial era is now a derelict ruin.

A collection of abandoned typographic signs from Berlin and beyond.

The "Prussian Versailles" that is as glorious today as when it was built.

Solar observatory doubles as a daring display of Expressionist architecture, much to Einstein's chagrin.

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

An eerie, derelict amusement park in Berlin.

A surreal museum of extraordinary industrial objects.

The massive machine creates cracking displays of indoor lightning.

A tower-like theater in the Swiss Alps built to withstand the high winds and avalanches of the mountain pass.