South Korea's only sex-themed park.

A theme park made of glass, from the gleaming books on the shelves to the crystal fish in the mirror lake.

A Catholicism-themed restaurant where sacrilege is on the menu.

A Buddhist temple to honor insects that died for science.

A restaurant modeled after feudal Japan, where the waitstaff are trained as ninjas.

Step into a cartoon at this Seoul café that aims to evoke a two-dimensional scene.

After the famous composer died in Paris, his sister snuck his heart out of the country to honor his wish that it be buried in their native country.

A program of Communist glamour in post-Stalin Poland is preserved in this colorful museum.

A hidden art gallery in an abandoned Warsaw fort.

This secluded walkway overlooks a magnificently wild London green space.

Notorious artist squat renovated into legal studios.

The strikingly modern structure stands out among the brick buildings speckling the Harvard Business School's campus.

This bridge is embedded with a giant steel dragon that breathes fire from its mouth.

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

This banal Parisian entranceway is not what it seems.

The water-powered carriages are long gone, but for over a century this funicular railway has been the fastest route to the highest point in Paris.

Noirish green neon marks the location of one of the oldest private detective agencies in France.

Original cabaret handbills, posters, and feline artwork are a purrfect highlight of the Museum of Montmartre.

A modern-day Lascaux cave underneath Paris.

A series of abstract, silly sculptures represent the works of a great modern classical composer.

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

Down a cobblestone alleyway is a museum dedicated to Romanticism, with a secret garden.

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

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