A self-built mosaic house and sculpture park.

One woman's decades-long obsession with the "La Fée Verte."

The oldest and smallest cemetery in Paris is only open to the public twice a year.

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

The spiral staircase hidden inside this giant Parisian column was likely built for Catherine de Medici's astrologer.

The artist and his brother are buried in a landscape straight out of a van Gogh painting.

Museum in a swimming pool where the water still flows.

Ghosts of France's colonial past.

The world's largest reflecting pool is just two centimeters deep.

A French valley with forests so lush it was nicknamed "the Small Amazonia of the Pyrenees."

This innocuous-seeming building is actually the remnant of a major wartime brothel.

This is what trains will look like after the zombie apocalypse.

Beggars were miraculously "cured" of their fake ailments when they returned home to this 17th century Paris slum each night.

This ancient Roman bridge and aqueduct still stands as a wonder of classical construction.

Despite being considered a thoroughly American sport, basketball's oldest surviving playing field is found in the basement of a Paris YMCA.

A medieval military street hidden beneath a charming French fishing village.

A mosaic-tiled house built by graveyard sweeper Raymond Isidore.

This stunning French estate was so lavish that it landed its original owner in jail for the rest of his life.

An aluminum skeleton brings Chinese mythology to the French shore.

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

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

An iconic and eccentric bar for "Manouche" Jazz music keeps expanding its space—and its influence.

The fantastic architectural models of a French traveler.

Avant garde house of Pierre Cardin on the Cote d’Azur.