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

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

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

These medieval ruins have survived since the 12th century, even providing shelter from the Nazis.

An abandoned beach resort in Normandy reclaimed by artists.

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

Since ancient times these picturesque springs have been providing bathers with healing waters.

Lyon, France is home to two remarkably preserved Roman theaters, one dating back to 15 BCE.

Architect Le Corbusier built his friend a cubist house to match his impressive collection of cubist art.

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

This crumbling, graffiti-covered mansion sits tantalizingly within reach of the proletariat who frequent a public park.

A tiled, multi-level garden of survival in Lyon.

A public park off the beaten path with a beautiful waterfall and 13th century Cistercian abbey.

A self-built mosaic house and sculpture park.

This salt marsh in Southern France is as pink as the flamingos that inhabit it.

This French castle is said to have once held the Holy Grail but is now a gorgeous mountaintop ruin.

An icy lake tucked among jaw-dropping alpine panoramas.

The floorboard scrawling of a tragic madman is on public display outside a Paris hospital, much to the dismay of its opponents.

A natural arch carved by a river gave its name to the so-called "Cave of Forgotten Dreams."

Hundreds of secret cabinets built into the walls of legendary poisoner's private work room.

An aluminum skeleton brings Chinese mythology to the French shore.

For hundreds of years, automatons moving to metallic music have been marking the passage of time.

This natural French spring has been turned into a magical grotto by Roman and medieval constructions.

A subterranean shelter remains intact under a busy Paris railway station.