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

This Corsican Neolithic site is full of pre-Roman megalithic structures that may or may not be penises.

A crumbling island fortress that seems to be covered in a field of stone crosses but is simply incomplete.

This mountain trail inspired Nietzsche to complete his magnum opus.

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

The haunting concrete remains of a Nazi pebble crusher can still be found in this small French commune.

1920's reinforced concrete church by architect Auguste Perret changes the face of modern design.

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

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

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

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

A neighborhood church's unusual abstract stained glass was the final project of avant-garde artist Jean Cocteau.

An unusual sand beach in the middle of a forest.

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

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

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

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

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

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

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

A sanctuary for wolves in a community which once trembled in fear of the murderous "Beast of Gévaudan."

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

The final resting place of the "father of special effects."

French commune at the heart of conspiracies.