An image of the legendary saint stands in the shadow of a cathedral she liberated.

This small red school was where Germany signed their surrender during WWII.

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

This massive library holds what was once the largest book collection in the world.

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

Abandoned railway line circling the city of Paris.

The narrowest street in Paris.

Miles of man-made caves and tunnels are currently used for cultivating mushrooms.

A French library that makes sure its love of books is writ large... giant in fact.

A unique underground structure dating back to the 1st century BC.

What looks like a normal building is really a hollow facade hiding a subway vent.

This futuristic observatory at the top of the Pyrénées offers unrivaled views.

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

A centuries-old complex of hand-dug stone chambers has sheltered locals in times of trouble.

The sunken structure looks like the victim of a catastrophic flood.

Bits of architecture from a town destroyed in World War I now decorate this hotel garden.

Ivy-covered Medieval tunnels cut through this charming town in France's Loire Valley.

The 16th-century church was kept in its ruined state as a reminder of the casualties of World War I.

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

A swath of France so devastated by war it is still forbidden to go there.

Hundreds of prehistoric stones, arranged in perfect lines in a French field.

Since ancient times these picturesque springs have been providing bathers with healing waters.

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

A French valley with forests so lush it was nicknamed "the Small Amazonia of the Pyrenees."