The seamy, underground secrets of Portland's criminal past.

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

A quaint Russian village in the middle of a German metropolis.

The ruined remains of the airport Claus von Stauffenberg departed in his failed attempt to kill Adolf Hitler.

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

Gardens representing parts of Asia, Europe, and the Mid East are tucked away among the Soviet-style buildings in East Berlin.

This conical hill was built as a testing ground for an engineer known as the Glider King.

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

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

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

The world's first clock to use set theory as a measure of time required the invention of a new light bulb just to maintain its obtuse measurements.

Art and a pun, all in one.

A surreal museum of extraordinary industrial objects.

An old department store turned Nazi prison turned artist commune.

Fall down the rabbit hole into a surreal journey of human consciousness "from ass to soul."

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

Where once there was a train station bathroom, there is now this German burger joint.

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