The stones of this formerly witch-obsessed castle were used to build a church.

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

This abandoned Belgian fortress is purposefully being left to nature.

This medieval castle overlooking the Elzbach river looks just like it did hundreds of years ago.

This Luxembourg cave is covered in cryptic looking marks left by mining activity.

This noble mash-up in eastern Luxembourg is part Medieval, part Renaissance, all castle.

Once the local rulers had gone these enchanting ruins housed common folk in an almost real life fairy tale.

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.

This stunning French estate was so lavish that it landed its original owner in jail for the rest of his life.

Ghosts of France's colonial past.

An odd museum dedicated to French fakes.

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

One of the greatest maze designer’s greatest mazes.

A cave dwelling that was started by the Celts, expanded by monks, and finished by knights.

This French ghost town from World War II has been left as a memorial to German atrocities during World War II.

One of the great treasures of Neolithic art lies within this carefully constructed pile of rocks.

The largest underground church in Europe.

Abandoned Nazi train station turned underground astroparticle laboratory.

This French castle is said to have once held the Holy Grail but is now a gorgeous mountaintop ruin.

15,000 year old bison sculptures.

Historic medieval fortified city in southwest France.

What better way to honor a pioneering anatomist than by preserving his severed head like a specimen?

Resting on a hill overlooking the coast, these medieval ruins look completely deserted save for their restored chapel.