The remaining relics of the patroness of Paris lie in a chapel under a striking double spiral staircase.

This recessed garden protects thousands of mountain plants by creating its own microclimates.

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

Got apples?

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

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

Museum on French naval history, with magnificent figureheads, a historic diving suit, and a boat used by Napoleon.

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

Noirish green neon marks the location of one of the oldest private detective agencies in France.

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

An off-the-beaten-path boutique stuffed with an eclectic collection of upcycled goods.

An overlooked marble is the only surviving in-place 18th century example of the measurement that changed how we define distance.

Medieval museum built over Roman baths that features famous tapestries of a lady and a unicorn.

19th century pendulum and a clock restored by a rogue group of guerilla artists.

Behind the pink curtain, Au Bonheur du Jour, an art gallery of erotic archives.

18th century underground pilgrimage site, dedicated to a Saint that did something...

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

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

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

This massive blockhead sculpture hides an entire library.

A Gothic cathedral created from volcanic rocks.

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

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

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