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

A popular shrine where the Blessed Virgin allegedly appeared in 1830, displaying a holy armchair and two incorruptible remains of Lady Saints.

Twelve grave-faced marble angels guard the emperor's tomb at Les Invalides.

This former “ante-chamber to the guillotine” has been refurbished to illustrate the brutal history of French justice.

In the best of all possible worlds, everyone will get a chance to see this statue in which Voltaire's heart is interred.

Down a cobblestone alleyway is a museum dedicated to Romanticism, with a secret garden.

A museum on the history of Paris, including a set of Napoleon's toiletries, Proust's room, and relics of the Revolution.

Indents in the pavement are all that remain from a grisly death machine in Paris.

19th century pendulum and a clock restored by a rogue group of guerilla artists.

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

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.

This historic club for wayward boys has shaped some of the biggest names in music almost as much as they have shaped it.

This charming English house was once the home of England's most famous poet.

This mummified mermaid corpse is an aquatic curio that was eventually revealed to be a fake.

Half-eaten food on display at an English café.

A museum devoted to the science of color.

A spooky juxtaposition of caves and graves gives this legend-filled cemetery a particularly haunting vibe.

This ancient bridge made of stone slabs is said to be reserved for the devil to sunbathe.

Under a church hides a forgotten 13th-century ossuary containing the remains of around 2,500 people.

Hidden in a grotto 26 feet below Nottingham's oldest hotel, this stylish subterranean drinking den is notoriously hard to find.

The oldest inn in England served brew to the crusaders.

A house of bones — but nobody is quite sure to whom they belong.

The largest cave chamber in Britain—big enough to fit a whole cathedral inside.