The headless bodies of more than 1,300 guillotined victims of the Reign of Terror are buried here in mass graves.

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

A lone cannonball remains lodged in the walls of the Hotel de Sens as a sober reminder of a revolution.

For more than a century, revolutionary graffiti has marked the wall of a Parisian church.

A set of seven houses, each built in a style that represents a European country.

This bird-loving brewery is situated in an old municipal bathhouse, nestled beside a 300-year-old windmill.

The world's only museum devoted to the wonders of fluorescence.

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

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

This crumbling, graffiti-covered mansion sits tantalizingly within reach of the proletariat who frequent a public park.

The mummified heart of Louis XVII, the lost dauphin of the French Revolution.

Abandoned railway line circling the city of Paris.

The tomb of history's greatest potato promoter is surrounded by tubers.

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

The Argonaute submarine was the French navy's pride and joy in the 1950's.

Remains of Roman amphitheater hidden in a sleepy quarter of Paris.

The history of radiation is on safe display at the foot of a radiation science laboratory.

An odd museum dedicated to French fakes.

Saintly bones pressed into a wax effigy of a Catholic superstar.

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

An overlooked marble is the only surviving in-place 18th century example of the measurement that changed how we define distance.

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

The very center of Paris is surrounded by a bevy of strange good luck rituals.

The narrowest street in Paris.