The celebrated eyesore created by starry-eyed sweethearts.

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

Former hunting lodge of a duke who was an avid collector of impressionist works.

Walk through spectacular aisles of hanging meat and wagon wheel–sized cheese at the world's largest wholesale food market.

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

An immersive projection art installation uses sound, scale, and light to take visitors inside classic works of art.

An iconic and eccentric bar for "Manouche" Jazz music keeps expanding its space—and its influence.

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

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.

A surrealist timepiece by the artist of melting clocks.

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

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

This massive library holds what was once the largest book collection in the world.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

Century-old shop, specializing in Occult products.

The last of Philadelphia's wood-paved streets is now a landmark of terrible engineering.

This Philly landmark has a giant butterfly pavilion, three floors of insect displays, and withstood a $40,000 heist.

Once part of a dam servicing an early 19th century grist mill, the tucked-way falls are a tricky-to-find urban oasis.

Dive for drinks at Croatia's first and only underwater winery.

Hidden in the hills of Hollywood, this secluded Oz-themed garden is dotted with dozens of thrones.

This diner's a kitschy dreamland for anyone whose heart is stuck in the 1980s.

More than 250 sakes are available in an izakaya hidden in the basement of a Midtown office building.

Suspended above the ground in a thicket of towering Georgia trees is a modern architectural wonder.