An expansive complex of subterranean tunnels is all that remains of one of Europe's most formidable medieval fortresses.

This massive collection of taxidermy is full of specimens collected by missionaries during their international travels.

This massive steel pyramid can be entered by a set of jagged steps that let visitors stand in its heart.

This former steel and coal plant is now a neon-lit industrial fantasia.

The Bauhaus-style former industrial complex is considered the world's most beautiful coal mine.

The monumental home of Prussia’s eccentric "Cannon King."

This futuristic German television spire is actually the world's largest digital clock.

Twisted buildings adorn the banks of the Rhine river.

An abandoned underground bathroom is now a space for public art.

Be it nature, art, or abandoned military architecture this eclectic German "museum" has you covered.

This strange building looks like a medieval fortress crashed into a 1960s Brutalist office block.

Largest illuminated advertisement sign in the world.

The largest mosque in Germany.

Residing along a busy thoroughfare, this sculpture urges passersby to consider the future.

A church filled with the bones of hundreds of virgins martyrs—or so they say.

Thousands of tourists and residents in Cologne affix "love padlocks" on the Hohenzollernbrücke Bridge to symbolize their affections.

A marble Lucifer hides behind the pulpit of this Gothic cathedral.

A massive, gleaming sea turtle with a rider atop its shell looks out over the horizon.

The former home of a trailblazing surrealist is still filled with haunting dolls and grim paintings.

The last Oostende trawler to fish off Iceland is now a museum.

A little sculpture with a large wardrobe.

This fairytale castle was built as a show of power but was nearly torn down thanks to its history of torture.

Climb inside an iron crystal magnified 165 billion times its normal size.

A collection of weird and wonderful art fills a former houseplant nursery.