Nicknamed the "Museum of Horrors," this French anatomical collection has been fascinating visitors for over a century.

One of the world's most complex timepieces.

This collection of French root art looks like an indoor fairy wonderland.

An ancient monastery, a locked room, and a mysterious book heist.

This whimsical castle of grottoes was the labor of love of a French postman, and one of the greatest achievements of outsider architecture.

France's most famous cemetery, with some of its most curious tombs.

One of the oldest medical collections in Europe focusing on rare surgical instruments.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

The macabre collection of Jacques Sirgent, an expert scholar on the undead and all of their trappings.

First museum dedicated to the research and history of Epilepsy.

Ruins of a German Castle on top of a towering stone pillar.

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

The fairy tale castle of the "fairy-tale king."

An eerie, derelict amusement park in Berlin.

A fake Transylvanian castle houses a cathedral of antlers.

A Hungarian pharmacy museum with a box full of mummy powder.

Once the home of a hermetic monk, this cave now houses a small church.

A 19th century artistocrat's mansion, turned into a library, hidden in a modern library.

A series of caves under Castle Hill that once held the prisoner Vlad Tepes, better known as Count Dracula.