This conical hill was built as a testing ground for an engineer known as the Glider King.

Art and a pun, all in one.

This collection of 80 polarizing foods aims to challenge your subjective notions of repulsion.

A museum dedicated to the history of psychiatric treatment featuring a gallery of art made by patients.

Largest island in the Baltic Sea experiences such idyllic weather that roses bloom in the middle of December.

Stockholm's famed ghost train is now on display at an art park in northern Sweden.

Was the twisted roof on this church's belltower an intentional design or a happy accident?

This museum in a Paris apartment gives a unique look at the iconic French singer's life.

The narrowest street in Paris.

This natural French spring has been turned into a magical grotto by Roman and medieval constructions.

A taxus-tree to which Julius Caesar reputedly tied his horse.

Inside this former medieval prison is a collection of objects designed to inflict unbelievable pain and suffering on the human body and mind.

A museum dedicated Germany's favorite drink and most well-known festival.

Stuffed people arranged in unsettling scenes give a voyeuristic glimpse of life within a historic old hotel.

The world's first and only museum dedicated to dachshunds.

A man-made slag heap that you can "ski" down, and is home to the world sandboarding championships.

The telescope that discovered Neptune.

Nestled within a German forest is an intriguing, growing rock.

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

A former Nazi lookout tower with a magnificent view of the Rhineland.

Four-story slides send people whizzing through the math department at this Munich university.

Built to test magnetically levitated elevators, the tower also boasts Germany's highest visitor platform.

A series of haunting wooden totems are hidden in the woods surrounding a German environmental center.

Retirement home for giant obsolete machines.