This former Nazi castle was built as a school to train what would have been the future of the Third Reich.

This German art chapel is perfect for those who like their worship hard, modern, and utterly alien.

A top-secret bunker now turned museum, is an eerie look at what life would have looked like in the event of nuclear war.

A varied collection of brains in alcohol.

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

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

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

This gigantic monument hidden in the woods was built to thank the Dutch for sheltering Belgian refugees during World War I.

This former hydraulic laboratory is now a woodland dotted with old engineering models.

Home to the world's oldest functioning orrery.

Three floors of musical instruments coming from all corners of the world and hundreds of years of musical history.

Each spring, a dreamlike carpet of bluebells overtakes the forest floor.

This still-celebrated home was a radical architectural experiment in 3D De Stijl.

Oldest Museum of the Netherlands is a true cabinet of curiosities.