An exquisite and eclectic selection of African masks stands out within a massive woodcarving marketplace.

Tables of secondhand books fill the inner courtyard of this 17th-century stock exchange.

Every day is like Christmas on this street where the traditional Neapolitan nativity scene comes to life.

World's first "penitentiary," meant to be humane, drove men insane.

A treasure trove of artifacts, books, and artwork from the "golden age" of exploration.

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

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

Bring your own cardboard to the slippery slopes of concrete hidden in a neighborhood park.

The legendary building that needed ghostly approval before being built.

Here, at the "world's longest art gallery," you'll find forty miles of ancient petroglyphs and pictographs.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

Tucked in the back of this amazing antique store is an important piece of medical history.

This iconic L.A. bookshop is housed in an abandoned bank—both symbolic and chic.

Rippling sand dunes frozen in the Arizona rock.

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

The neon signs from Las Vegas' past find their final resting place at this unusual graveyard.

A kaleidoscopic warehouse-maze of handmade neon signs.

France's most famous cemetery, with some of its most curious tombs.

This shop and gallery is a modern-day cabinet of curiosities, unassumingly positioned along an urban thoroughfare.

This secluded aqua waterfall in the Grand Canyon is the perfect swimming hole, and the Havasupai tribe's fiercely protected natural wonder.

A tiny theater hidden in an alley plays a constant stream of short silent films for anyone willing to peer through the peephole.

The mysterious, fantastical woodland inspiration for "The Lord of the Rings."

Most-visited and most-photographed slot canyon in the American Southwest.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.