The patron saint of spinsters grasps a container of dried blood.

An abandoned NSA listening post on Berlin's "Devil's Mountain."

This demon atop the Notre-Dame de Paris looks utterly bored.

Stripes of human ashes cover a back lawn in the most sought-after burial grounds in Paris.

The industrial architecture honors the laborers who brought the Exposition Universelle of 1900 to life.

The historic Masonic Lodge in which the first-ever female Mason was initiated.

The remaining relics of the patroness of Paris lie in a chapel under a striking double spiral staircase.

An unusual number plate signifies the building's saucy past.

A 16th-century fountain marks the site of a lost medieval cemetery once filled with mass graves.

In this Parisian garden's grotesque former life as a zoo it fed exotic animals to the bourgeois and put humans on exhibit.

BDSM, 1930s Style.

This innocuous-seeming building is actually the remnant of a major wartime brothel.

Original cabaret handbills, posters, and feline artwork are a purrfect highlight of the Museum of Montmartre.

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

The recovered bones of martyrs slaughtered during The Terror are on display in this church crypt.

This off-limits room in the National Library of France is home to a system of pneumatic tubes, once used to bring books to readers.

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.

Pitié-Salpêtrière was the dumping grounds for women who received the dreaded diagnosis of "hysterical."

Hidden away in a modern library are the remains of one of the 18th century's most celebrated wunderkammers.

The first green space constructed on an elevated viaduct.

A unrivaled and rather horrifying collection of wax dermatological models.

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

How did a French journalist’s grave become the sexiest statue in the cemetery?