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

A theme park that suffered massive flooding during Katrina was abandoned, and now proves irresistible to trespassing explorers.

This beautiful building in the heart of Manhattan's Financial District was empty for decades.

These fantastically named natural pools look like something out of a Scottish myth.

Amid the bustle and noise of the Financial District hides a secluded garden oasis above the city streets.

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

An eerie, derelict amusement park in Berlin.

A snapshot of the city's fascinating voodoo culture.

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

A tiny museum housed in a New York freight elevator specializes in the "overlooked, dismissed, or ignored."

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

An exquisite tunnel of cascading flowers.

A crumbling hospital from the 1850s on Roosevelt Island.

A kaleidoscopic warehouse-maze of handmade neon signs.

A collision of human error and natural geothermal pressure created this rainbow-colored geologic wonder.

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

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

Non-profit time travel mart sells goods you would need for a trip through the fourth dimension.

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

A psychedelic labyrinth on the San Francisco bay.

An artsy hidden staircase leads to breathtaking views of San Francisco.

A terrific purveyor of natural history objects and curios.

A huge musical instrument played by the ocean.

London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.