An ancient ossuary in Rouen.

The famous winding walk at Chartres is surrounded in mystery and myth.

A mosaic-tiled house built by graveyard sweeper Raymond Isidore.

18th century underground pilgrimage site, dedicated to a Saint that did something...

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

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

Architect Le Corbusier built his friend a cubist house to match his impressive collection of cubist art.

Abandoned railway line circling the city of Paris.

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

A charming flea market shop dedicated to retrofuturistic apparati.

Ordinary art transforms to extraordinary thanks to locals' quirky sense of humor.

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

A museum of carnival attractions where you are invited to ride the rides.

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

The floorboard scrawling of a tragic madman is on public display outside a Paris hospital, much to the dismay of its opponents.

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

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

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

This museum in a Paris apartment gives a unique look at the iconic French singer's life.

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

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

A grotto-like lodge decorated with gilded mosaics, rocks and a noisy waterfall was the setting for the most sumptuous pleasure house of 1900s Europe.

A museum which takes visitors to the côté obscure of Paris.

A museum of magic with a Sadist past.