An Italian geologic wonder that served as the inspiration for the landscape of Dante's hell.

The second-largest natural arch in the Chartreuse Mountains.

A precariously balanced goose-shaped boulder with a dark legend.

A snowy highland notorious for unexplained aircraft crashes is France's own Bermuda Triangle.

This garden houses the remains of the ancient Greek port of Marseille.

An abandoned nightclub has become a vibrant work of art.

The ruins of an abandoned cemetery are among the last remnants of the old village of La Boulaye before a wealthy landowner had it relocated.

A granite rock formation littered with various species of moss, lichen, and fern.

This crack in France's seaside cliffs once hid a sinister secret.

For a brief time in 1960s France, families could climb into a tiny submarine and be pulled along an underwater journey.

Even France's favorite aquatic son Jacques Cousteau, couldn't get to the bottom of it.

A huge Megalithic chamber tomb located behind a cafe.

Longest canal tunnel in the world, abandoned in the 1960s.

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

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

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

Series of underground houses inhabited continuously for centuries.

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

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

This submersible road connecting a French island to the mainland is lined with safety towers for when the tide strands travelers.

The Church of the Annunciation was carved into the face of a cliff, just like the rest of the town of Haute-Isle.

A quaint medieval millhouse hovers surprisingly above the waters of the Seine.

An isolated 17th-century chapel on a remarkable site once dedicated to Celtic sun worship.

A self-built mosaic house and sculpture park.