One of the great treasures of Neolithic art lies within this carefully constructed pile of rocks.

The ruins of a medieval castle linked to the murderous French lord that inspired the famous legend of Bluebeard.

Personal garden filled with mosaics made of recycled garbage.

The remains of this castle, known as the Witch’s Eye, watch over the Thur Valley.

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

Old vessels have been transformed into artistic canvases in this unusual cemetery.

An underground city of ancient quarry tunnels hid thousands of Allied soldiers in WWI.

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

Natural mummies hidden in the crypt of a medieval French church.

This French "sea of rocks" is packed with stunning rock formations and its own medieval castle.

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

For over 300 years this little carving has been the city’s good luck charm.

A huge Megalithic chamber tomb located behind a cafe.

This building’s ghostly exterior reflects its former lives as a prison, school, and funeral home.

French commune at the heart of conspiracies.

A daring D-Day assault by U.S. Army Rangers is commemorated atop the high cliffs of this strategic point.

This triumphal arch celebrating the Sun King's conquest of Lille is a masterpiece of military architecture.

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

Series of underground houses inhabited continuously for centuries.

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

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

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

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

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