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

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

Ghosts of France's colonial past.

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

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

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

An aluminum skeleton brings Chinese mythology to the French shore.

A beautiful and classically designed villa, with an hourly infestation of monsters.

Beautiful carved tunnels.

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

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

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

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

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

The fantastic architectural models of a French traveler.

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

This professional clown's home is an outsider art wonderland.

These quaint French houses dangle precariously over a precipice.

A well-preserved medieval village nested on a rocky outcrop and surrounded by a network of cliffs, natural bridges and canyons.

The recovered bones of martyrs slaughtered during The Terror are on display in this church crypt.

A Gothic cathedral created from volcanic rocks.

The largest underground church in Europe.

Hidden away in a modern library are the remains of one of the 18th century's most celebrated wunderkammers.

Skeletons, medical artifacts, and other obscure and precious treasures all displayed in a wooden pharmacist's cabinet.