The tradition of open-air secondhand and antiquarian bookselling in Paris dates back to the Renaissance.

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

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

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

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

This frog-themed restaurant was frequented by Picasso, Saint-Exupéry, and more.

Once a 19th-century brasserie, this McDonald's exterior celebrates Alsatian design and the "King of Beer."

The narrowest street in Paris.

This surreal statue brings a famous French novel about a supernatural cad to arresting life.

A Parisian exterminator's shop whose storefront displays stuffed rats hanging from traps.

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

The subterranean "lake" below the Paris opera house inspired the Phantom of the Opera's lair.

Paris' fabled purveyor of exotic taxidermy and natural history curios.

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

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

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

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

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

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

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

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

This statue was given to France by the United States to commemorate the centennial of the French Revolution.

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

This museum houses an imposing skeleton army comprised of creatures great and small.