The abandoned remains of this Victorian brewery hide crumbling bowling alleys and rusting industrial gear.

This World War II bunker now survives as a documentation of the Nazi regime and war crimes.

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

Super-heavy Nazi architectural experiment.

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

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

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

An accidentally hidden library containing the ephemeral history of New York.

The home of one of America's most beloved fictional characters has become a real world landmark.

Little Red Lighthouse under the George Washington Bridge.

Rummage through this sunken ship, but leave your scuba gear at home.

Hear the tales of New York's most notorious criminals.

A curious fountain that has no water and includes Satan, a crab, and 9 giraffes.