This unique Renaissance castle was turned into a home for Nazi occultism.

No need to strap in for a "ride" on this walkable roller coaster.

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

A museum dedicated to the history of a terrifying secret police is now held in their former headquarters.

An eerie, derelict amusement park in Berlin.

The largest free-standing aquarium in the world resides in a hotel lobby in Berlin.

The birthplace of an eccentric alchemist and possible inspiration for the fictional reanimator of monsters.

A slice of central Asia in the middle of Berlin.

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

A tiny theater hidden in an alley plays a constant stream of short silent films for anyone willing to peer through the peephole.

The museum calls itself the "National Museum of the Paranormal" and is full of eerie oddities.

This headstone-like marker inscribed with three words has been an utter mystery for over a century.

The largest cave chamber in Britain—big enough to fit a whole cathedral inside.

An elevator into the Baltic Sea.

This shop and gallery is a modern-day cabinet of curiosities, unassumingly positioned along an urban thoroughfare.