This "floating railway" is one of the world's oldest monorail systems.

This historic stone bridge has an entire neighborhood clinging to its sides.

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

A striking 12th-century-style castle built on the edge of a cliff.

Soaring over 6,000 feet in the Bavarian Alps, this beer garden was once Hitler's 50th birthday present.

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

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

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

When the rain falls, this drain system turns into a musical instrument.

A collection of abandoned typographic signs from Berlin and beyond.

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

A sprawling Baroque park with 300-year-old hydro-pneumatic waterworks.

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

A slice of central Asia in the middle of Berlin.

Ruins of a German Castle on top of a towering stone pillar.

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.

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

The abandoned military base looks like a post-apocalyptic wasteland.

This Hungarian stilt village is built in a lake that never freezes over due to the power plant that that uses it as a cooling pond.

The abandoned "Red Star Train Graveyard" is the final rusting place for precious artifacts of train history.

This Hungarian castle was built out of cardboard and wood until it proved so popular that it got upgraded to stone.

A 19th century artistocrat's mansion, turned into a library, hidden in a modern library.

This Budapest bar allows drinkers to leave their mark on the walls, floor, and even ceiling.