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

Beggars were miraculously "cured" of their fake ailments when they returned home to this 17th century Paris slum each night.

This little-known relic crypt holds stolen parts of a Roman Empress.

Despite being considered a thoroughly American sport, basketball's oldest surviving playing field is found in the basement of a Paris YMCA.

135 bronze medallions mark a French meridian line which once rivaled the hotshot Greenwich timeline.

A lone cannonball remains lodged in the walls of the Hotel de Sens as a sober reminder of a revolution.

Where the high court feasted, frolicked, and high courtesans put their royal lovers' diamonds to the test.

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

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

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

This former “ante-chamber to the guillotine” has been refurbished to illustrate the brutal history of French justice.

In the best of all possible worlds, everyone will get a chance to see this statue in which Voltaire's heart is interred.

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

Exquisite wall sculptures carved in secret by an early quarryman in an obscure corner of the Paris Catacombs.

The ruins of a Duke's bucolic dream, where camels once roamed alongside "Dutch" windmills and faux-Italian vineyards.

A museum on the history of Paris, including a set of Napoleon's toiletries, Proust's room, and relics of the Revolution.

A subterranean shelter remains intact under a busy Paris railway station.

A Parisian cemetery where the elite and artistic are interred beneath an eccentric collection of tombs.

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

Egyptian Revival movie palace abandoned for decades and restored in 2013.

Indents in the pavement are all that remain from a grisly death machine in Paris.

A surrealist timepiece by the artist of melting clocks.

Walk upon the mementos of the dead in this Parisian courtyard paved with medieval tombstones.

A mechanized clock where a man fights off a dragon, crab, and rooster.