A massive, secret marina for the Nazis' most formidable weapon in the Atlantic.

Fighting the British and making game shows for over 150 years.

A castle-like sea fort from the 17th century is now a museum to oyster farming.

Grottoes, sculptures, and recycled ceramics permeate what was once just a small farm in France.

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

A small town hallucinates en masse - Bad bread, or CIA science project?

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

Walk through living pictures and music in the Cathedral of Images.

Sculpture of a legendary French dragon.

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

Historic medieval fortified city in southwest France.

The huge golden reliquary of a testicle-smashing saint.

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

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

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

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

This narrow path was cut right into a French mountainside to feed the country's early naval expansion.

An abandoned nightclub has become a vibrant work of art.

Bordered by forest on three sides and the ocean on the other, the Great Dune of Pilat is the highest sand dune in Europe.

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