Rainbow-hued local gem in Venice.

A phantasmagoric tomb honors a Belgian artist-scientist's contributions to the world of spooky entertainment.

A tribute shrine where the Space Invasion street art movement started.

This mural painted by Keith Haring was done without payment as a gift to entertain the children at the Hôpital Necker.

The video game-themed street art first popped up in the French city.

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

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

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

A modern-day Lascaux cave underneath Paris.

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

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

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

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

The ruins of a Duke's bucolic dream, where camels once roamed alongside "Dutch" windmills and faux-Italian vineyards.

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.

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

A museum of carnival attractions where you are invited to ride the rides.

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

Abandoned railway line circling the city of Paris.

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

World's oldest operating science fiction and fantasy club, once home to Ray Bradbury and L. Ron Hubbard.

The world's largest aggregation of great white sharks is at a mysterious spot in the middle of the ocean.

Formerly a lovely white sand beach this Hawaiian stretch is now a trap for countless tons of trash.