Super-heavy Nazi architectural experiment.

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

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

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

Named after a militant urban guerilla, this famous former squat is a graffiti-covered stronghold of leftist culture.

After a nearly successful attempt on Hitler's life, the conspirators met their fate in the courtyard of this Berlin building.

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

The bunker where Hitler took his own life is hidden under this deliberately ordinary parking lot.

A slice of central Asia in the middle of Berlin.

The site of the famous Nazi book burning campaign of 1933 remembers its "Night of Shame".

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

Beneath the impressive baroque cathedral that rises from the center of Berlin lies the largest collection of Prussian royals in the world.

A fascinating insight into daily life in the Eastern Bloc.

The ghost town left by the worst nuclear disaster of all time is being taken over by nature and urban explorers.

Abandoned soda factory on a Cambodian roadside in a state of beautiful decay.

This impressive clifftop temple was once at the center of an international custody dispute.

Vietnam's feral abandoned water park offers access to a post-apocalyptic funscape, now with fewer crocodiles.

An extravagant monument to an extravagantly unpopular Emperor.

This bridge is embedded with a giant steel dragon that breathes fire from its mouth.

This Vietnamese hell cave lets visitors take a walk through a devilish underworld full of demons.

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

Perfectly preserved ancient monastery in an impossibly dramatic location on a rocky island in the Atlantic.

On Japan's Tashirojima Island, cats are king.

Once the most densely populated place in the world, this island is now a ghost town.