The real life town from the Pied Piper of Hamelin has a mechanical puppet show that retells the famous story many times a day.

The world's oldest rose is so tough it survived being bombed in World War II.

The mass grave of the 27 victims of the "Vampire of Hanover."

An extraordinary mechanical calculator designed by the mathematician and philosopher Gottfried Leibniz.

Striking occult iconography on a medieval German church.

A towering monument to war, located on a beautifully peaceful hill.

When German-Iraqi relations broke down, this embassy was vacated post haste.

Berlin's oldest surviving academic architecture hosted decades of animal dissections.

Super-heavy Nazi architectural experiment.

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

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

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

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

A surreal museum of extraordinary industrial objects.

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

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

An eerie, derelict amusement park in Berlin.

This imposing 20th-century castle was abandoned before it was ever completed.

This 700-year-old structure is one of the most unique architectural and historic monuments in Gdańsk.

An abandoned Nazi explosives plant founded by the inventor of dynamite is now an underground museum.

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

The walls and ceiling of this Polish church are decorated with thousands of skulls, with another 21,000 skeletons just below.

A wooden replica of France's famous tower.

The hidden "ballroom" under a mansion lake was built by a criminal who ate a cyanide pill during his trial.