This ancient theater was once the home of fierce gladiatorial battles.

What looks like a normal building is really a hollow facade hiding a subway vent.

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

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

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

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

One of the largest ochre quarries in the world, hidden in a limestone landscape.

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

Ivy-covered Medieval tunnels cut through this charming town in France's Loire Valley.

A bike train runs along a disused railway line through the tranquil French countryside.

An abandoned beach resort in Normandy reclaimed by artists.

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.

Saintly bones pressed into a wax effigy of a Catholic superstar.

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

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

These quaint French houses dangle precariously over a precipice.

Sleep in a climate-controlled plastic bubble for the night.

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

In this Parisian garden's grotesque former life as a zoo it fed exotic animals to the bourgeois and put humans on exhibit.

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

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

The fantastic architectural models of a French traveler.

Monsters and miniatures are held in equal esteem at this wondrous museum.