This modern French ossuary contains the jumbled bones of 130,000 WWI soldiers.

This ancient Roman bridge and aqueduct still stands as a wonder of classical construction.

The fantastic architectural models of a French traveler.

An enchanting work of outsider art, full of whimsical sculptures and carvings.

This stunning natural double arch, the largest in the Alps, went undiscovered until 2005.

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

A well-preserved medieval village nested on a rocky outcrop and surrounded by a network of cliffs, natural bridges and canyons.

Avant garde house of Pierre Cardin on the Cote d’Azur.

A Gothic cathedral created from volcanic rocks.

Historic medieval fortified city in southwest France.

A 14th century bridge built as a fortress, where the devil lurks on one of its towers.

This historic island prison holds one of the dungeons from the Count of Monte Cristo even though it is a work of fiction.

An icy lake tucked among jaw-dropping alpine panoramas.

This salt marsh in Southern France is as pink as the flamingos that inhabit it.

Ancient paintings known as the "Sistine Chapel of Cave Art."

Walk through spectacular aisles of hanging meat and wagon wheel–sized cheese at the world's largest wholesale food market.

This whimsical castle of grottoes was the labor of love of a French postman, and one of the greatest achievements of outsider architecture.

This medieval tower is all that remains of the castle where Joan of Arc was held before being burned at the stake.

Do these monsters look familiar? The gargoyles on this church are all from pop culture.

This small island, a byproduct of 19th-century canal construction, is now home to a charming Japanese garden.

This Bordeaux parking garage has 712 indoor spaces, and one outdoor.

Beneath the city of Lourdes, France is a massive, concrete church.

15,000 year old bison sculptures.

Abandoned blockhouses from Nazi Germany's Atlantic Wall erode into the sea on a French beach.