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

There is a strange little carving of a person seemingly crushed by a pillar behind the remains of St. Thomas Aquinas.

Artist's eccentric property excessively decorated with found objects and work of his own.

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

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

Series of underground houses inhabited continuously for centuries.

Jean Tinguely's bizarre monster sculpture is hidden deep in a forest.

One man's desire to transcend art led to the construction of this outsider chapel.

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

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

One of the world's most complex timepieces.

An architectural oddity of six stories, accessed by graceful ramps.

France's high-tech, future-themed amusement park.

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

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

An art world insider finds himself battling for his artistic home.

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

A unique underground structure dating back to the 1st century BC.

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

These crumbling Nazi artillery bunkers are now fair game for massive graffiti projects.

Trek into the depths of the cave where 17,000-year-old paintings exist alongside 400-year-old graffiti.

A French library that makes sure its love of books is writ large... giant in fact.

A centuries-old complex of hand-dug stone chambers has sheltered locals in times of trouble.

The post-apocalyptic remnants of a bucolic town ruined by a plane crash.