A centuries old castle atop a dormant volcano houses museums devoted to both women and witches.

Terrifically morbid cemetary and site of famous Paracelsus' grave.

Macabre museum devoted to historical Viennese murders.

The final resting place for the remains of 143 Habsburg royalty.

The crypt of the imposing Stephensdom holds royal intestines and thousands of skeletons.

An early 20th-century sanatorium, long abandoned and now being reclaimed by nature.

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

A fantastical bed and breakfast with magically unique rooms.

Christ's blood preserved in a Belgian town.

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

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

A massive, secret marina for the Nazis' most formidable weapon in the Atlantic.

A memorial to the nearly 10,000 American soldiers laid to rest on the beaches of Normandy during WWII.

Located in the house where Gustave Flaubert was born, this odd museum has more to do with medical grotesquery than the Western novel.

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.

A series of abstract, silly sculptures represent the works of a great modern classical composer.

One woman's decades-long obsession with the "La Fée Verte."

The oldest and smallest cemetery in Paris is only open to the public twice a year.

The great Italian Renaissance painter was laid to rest here in the Chapel of Saint-Hubert.

The only remaining collection of flayed figures made by French "madman" Honoré Fragonard.

A Gothic cathedral created from volcanic rocks.

Historic medieval fortified city in southwest France.

Do these monsters look familiar? The gargoyles on this church are all from pop culture.