An ancient ossuary in Rouen.

Despite centuries of architectural innovation, this French castle is being built like it's the 13th century.

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

This lesser-known Frank Gehry building houses a treasure trove of cinema history.

A memorial to the nearly 10,000 American soldiers laid to rest on the beaches of Normandy during WWII.

100-windowed castle turned art gallery, built by one dedicated mason.

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

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

This enormous "cloth of the conquest" depicts the Norman invasion of England in mind-blowing detail.

The opulent home that inspired Tintin's Marlinspike Hall and the adventures within.

Lyon's "Wall of the Silk Weavers" is one of the largest murals in Europe.

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

One of the world's most complex timepieces.

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

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

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

Green labyrinth formed by a karstic maze hidden in a preserved oak forest.

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

This 14th century wine cellar is home to the oldest barrel-stored wine in the world.

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

A small house sits between two huge rocks, with its back to the sea.

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

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

This otherworldly French waterfall looks like its waters have turned to stone.