Inside a London bookstore, a fireplace that once belonged to the illustrator responsible for a famous set of tarot cards.

This bewitching Babylonian goddess haunts a hallway of the British Museum.

This coffee shop lies hidden beneath a historic church.

Behind the pink curtain, Au Bonheur du Jour, an art gallery of erotic archives.

A museum of magic with a Sadist past.

A counter-culture bookstore like no other hides in plain sight in the streets of Paris.

The oldest stone house in Paris was built by its most famous alchemist.

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

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

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

A Belle Epoque bordello turned into a themed love hotel.

An antique curios dealer and hybrid taxidermist.

Inside a former cabaret, seven floors of erotic art.

The tradition of open-air secondhand and antiquarian bookselling in Paris dates back to the Renaissance.

This recessed garden protects thousands of mountain plants by creating its own microclimates.

The spiral staircase hidden inside this giant Parisian column was likely built for Catherine de Medici's astrologer.

Skeletons, medical artifacts, and other obscure and precious treasures all displayed in a wooden pharmacist's cabinet.

A majestic lion statue guards this Parisian botanical garden, and feeds on an unsettling item.

Statue of death tucked in the University of Medicine courtyard.

The world's oldest rose is so tough it survived being bombed in World War II.

Goethe's "Faust" was inspired by these rock formations known as the "Devil's Pulpit" and "Witches' Altar."

On the highest peak in the Harz Mountains, science and the occult faced off in a failed attempt to turn a goat into a boy.

The strange behavior of a tween led to allegations of witchcraft and a curse being placed on anybody within earshot.

The fountain marks the area where hundreds of accused witches were burned at the stake.