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

The floorboard scrawling of a tragic madman is on public display outside a Paris hospital, much to the dismay of its opponents.

A popular shrine where the Blessed Virgin allegedly appeared in 1830, displaying a holy armchair and two incorruptible remains of Lady Saints.

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

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

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

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

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

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

Statue of death tucked in the University of Medicine courtyard.

Known as the "Dodo Manège," this carousel features a herd of animals that have disappeared—or may be gone soon.

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

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

"In the Dark" Restaurant in Paris offers dinner in complete darkness.

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

A surrealist timepiece by the artist of melting clocks.

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

This Parisian café sticks almost exclusively to an ethos of reuse.

A haunting collection of the vanished and disappearing natural world.

Roman ruins top white travertine terraces formed by ancient hot springs.

This massive complex is made up of hundreds of smaller temples that date back to the ninth century.

This statue dedicated to the story of a Flemish boy and his dog was relatively obscure in Belgium, but a cult sensation in Japan.