No one knows who created the statues or if they are arranged properly—let alone the artwork's real name.

The Cimetière des Chiens et Autres Animaux Domestiques is one of the oldest pet cemeteries in the world.

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

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

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

A museum dedicated to one of Paris’s most famous residents, tucked into a corner of one of the city’s most famous squares.

One of the oldest medical collections in Europe focusing on rare surgical instruments.

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

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

This sculpture is an instrument played by the swell of the seas.

The last remaining example of the boatmen's perches that once dotted the south bank of the Thames.

The broken skateboards that became a poignant memorial to a murdered skater.

Black cat statues guard this temple-like Egyptian revival factory.

The sculpture of the deceased cockatoo flops atop its personal plinth.

Drink your espresso at a Victorian-era urinal in this underground-restroom-turned-coffee-bar.

Tombstones and enigmatic inscriptions hide within a vault beneath a popular London arts venue.

These official units of measurement—including chains and perches—lie hidden beneath tourists' feet in a popular London hub.

This unique bridge curls up like a caterpillar to let boats pass and then unfurls again to span a small canal.

This overlooked street light once served as a KGB dead letter box.

A friendly pub with a sordid past in cock fighting.

Where condemned pirates met their grisly end at the gallows on the River Thames.

A relic of Victorian grandeur hides beneath a busy South London road.

The lab where the scientist made his groundbreaking discoveries is preserved on the basement floor of the Faraday Museum.

A musical composition 1000 years in length plays at the Trinity Buoy Wharf in London.