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

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

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

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

A Gothic cathedral created from volcanic rocks.

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

The headless bodies of more than 1,300 guillotined victims of the Reign of Terror are buried here in mass graves.

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.

A 16th-century fountain marks the site of a lost medieval cemetery once filled with mass graves.

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

Remains of Roman amphitheater hidden in a sleepy quarter of Paris.

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

Two awe-inspiring globes from the reign of the Sun King hang from the ceiling of France's national library.

This structure atop a craggy cliff in one of the most beautiful parks in Paris boasts an unbeatable view.

An immersive projection art installation uses sound, scale, and light to take visitors inside classic works of art.

Natural history museum celebrating biodiversity with a parade of taxidermy animals.

Sacked by Vikings, blessed by William the Conqueror, dealt a fatal blow during the French Revolution—these ruins have seen it all.

Walk through spectacular aisles of hanging meat and wagon wheel–sized cheese at the world's largest wholesale food market.

Twelve grave-faced marble angels guard the emperor's tomb at Les Invalides.

A majestic lion statue guards this Parisian botanical garden, and feeds on an unsettling item.

This whimsical castle of grottoes was the labor of love of a French postman, and one of the greatest achievements of outsider architecture.

This Parisian fountain is a little bit fantasy and a little bit nightclub.