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

A quaint medieval millhouse hovers surprisingly above the waters of the Seine.

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

Former hunting lodge of a duke who was an avid collector of impressionist works.

One of the world's most complex timepieces.

One of the largest ochre quarries in the world, hidden in a limestone landscape.

If they push on just the right spot, even the weakest person can move this titanic boulder.

The Church of the Annunciation was carved into the face of a cliff, just like the rest of the town of Haute-Isle.

A medieval church with largest and oldest collection of Renaissance frescoes in France.

A bike train runs along a disused railway line through the tranquil French countryside.

The encased skull that is widely believed to belong to St. John the Baptist.

An iconic and eccentric bar for "Manouche" Jazz music keeps expanding its space—and its influence.

A self-built mosaic house and sculpture park.

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

A medieval military street hidden beneath a charming French fishing village.

The Cimetière des Chiens et Autres Animaux Domestiques is one of the oldest pet cemeteries in the world.

An off-the-beaten-path boutique stuffed with an eclectic collection of upcycled goods.

Lyon, France is home to two remarkably preserved Roman theaters, one dating back to 15 BCE.

This is what trains will look like after the zombie apocalypse.

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

One woman's decades-long obsession with the "La Fée Verte."

An ancient monastery, a locked room, and a mysterious book heist.

A natural arch carved by a river gave its name to the so-called "Cave of Forgotten Dreams."

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