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

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

These quaint French houses dangle precariously over a precipice.

Massive puppet-automaton machines created by French artist collective Machines de l’Ile.

The fantastic architectural models of a French traveler.

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

An enchanting work of outsider art, full of whimsical sculptures and carvings.

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

The industrial architecture honors the laborers who brought the Exposition Universelle of 1900 to life.

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

This massive blockhead sculpture hides an entire library.

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

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

A Gothic cathedral created from volcanic rocks.

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

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

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

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

This Parisian gem is one of the most incredible ethnographic museums in the world.

The largest underground church in Europe.

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

Historic medieval fortified city in southwest France.

The mental institution where Van Gogh created some of his most famous work now allows guests to walk in the artist's footsteps.

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