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

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

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

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

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

An aluminum skeleton brings Chinese mythology to the French shore.

Beautiful carved tunnels.

The fantastic architectural models of a French traveler.

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

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

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

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

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

This modern French ossuary contains the jumbled bones of 130,000 WWI soldiers.

This stunning natural double arch, the largest in the Alps, went undiscovered until 2005.

Historic medieval fortified city in southwest France.

Do these monsters look familiar? The gargoyles on this church are all from pop culture.

The largest underground church in Europe.

Science fiction's grandfather has a fittingly marvelous tomb.

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

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

A 14th century bridge built as a fortress, where the devil lurks on one of its towers.

A cave dwelling that was started by the Celts, expanded by monks, and finished by knights.

Ancient paintings known as the "Sistine Chapel of Cave Art."