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

This beautiful Victorian ironwork masterpiece was built to keep London from smelling like poop.

Following the trail of an old metro line, this scenic path is haunted by a creepy spriggan statue.

Repository for more than 22 million pickled specimens.

A cemetery in Barcelona's Poblenou district is home to this touching funerary statue, which depicts death in the form of a winged skeleton.

A temple to modernity, tucked away amid Barcelona's more well known museums.

An unusual stroll through gentlemen's erotica demonstrates that pornography is timeless.

This semi-secret storybook hedge maze is also the oldest garden in the city.

The storefront of a ramshackle Parisian puppet theater.

A mud statue stands in the dark tunnels, seeming to hold up the weight of the city above.

A French artist's vague warning hangs over Belleville.

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

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

The curious underground history of keeping Paris clean.

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

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

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

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

A favorite Paris bar for U.S. expats, including Gershwin, Hemingway, and James Bond.

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

A counter-culture bookstore like no other hides in plain sight in the streets of Paris.

A haunting collection of the vanished and disappearing natural world.

The very center of Paris is surrounded by a bevy of strange good luck rituals.

This charming cobbled backstreet is the most Instagramable street in Paris, much to the residents' annoyance.