Legend has it this 11th-century castle was paid a visit from the devil.

A huge Megalithic chamber tomb located behind a cafe.

This 1,400-year-old abbey was once a powerhouse for music and intellectualism known across Normandy.

These medieval ruins have survived since the 12th century, even providing shelter from the Nazis.

Resting on a hill overlooking the coast, these medieval ruins look completely deserted save for their restored chapel.

An unsettling shrine dedicated to the ravenous beast that prowled 18th-century France.

A sublime medieval path adorns the marble floor of one of the most beautiful Gothic cathedrals in France.

Remains of the artificial harbours invented for the Allied invasion of Normandy can still be seen at sea.

A remote hilltop covered in giant monoliths haunts the Brittany countryside.

This army of concretions is an unexplained geological phenomenon unlike anything else in the world.

Series of underground houses inhabited continuously for centuries.

Figures of unknown origin carved into the surfaces of underground caves.

His "Lionheart" is entombed separately from the rest of his body.

An atmospheric, medieval-themed book store hides in a 13th-century underground space.

This emotive sculpture was originally created for the 1878 World's Fair.

Underneath a chalk hill in France lies what Hitler hoped would be the underground launching base for a devastating new weapon.

Tens of thousands of ancient rock carvings hidden in the heart of a French national park.

The castle was reconstructed to fit Kaiser Wilhelm II's romanticized vision of the Middle Ages.

A unique zoological park home to over 30 species of wild cats, both big and small.

The largest crypt ever constructed in France was built in the 11th century on an ancient Druid sacred site.

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

Perhaps the most beautiful of preserved saints, with a little help from Paris.

Located in the house where Gustave Flaubert was born, this odd museum has more to do with medical grotesquery than the Western novel.

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