A 300-yard long natural tunnel runs through a ridge deep in the Appalachian Mountains.

The restaurant keeps a hidden séance room on the second floor and reserves a table for the spirit of the former owner each night.

A shop full of natural curiosities, carnivorous plants, and costumed taxidermied mice.

An enormous park-like oasis, full of famous Chicagoans' graves.

A bizarre roadside attraction and the first instance of miniature golf in the world.

This "zoo" is a cross between a junkyard and a sculpture garden, featuring animals you won't see anywhere else.

A particularly creepy abandoned hospital that sparks interest for lovers of the supernatural.

Canyon walls shrouded in ferns.

A little piece of the Shire is hidden behind a plant nursery in Port Orchard, Washington.

Staircase winds down the side of Telegraph Hill through gardens, wild parrots flying overhead.

Sniff the Titan Arum's rotting flesh.

Crammed into a Baltimore row house is an oddities shop that sells everything from skulls to dead insects.

A house filled to the brim with oddities and curiosities.

One of New York's best collections of pinball is hidden in a secret bar in the back of this laundromat.

An abandoned castle owned and ignored by Masons carries a cursed history.

The mysterious wonder of an underground waterfall is illuminated by multicolored lights.

This massive store is home to an eccentric collection of vintage, retro, and peculiar goods.

A clear blue swimming hole with hidden caves, still unexplored.

Eons ago, a rushing lava river formed this pristine passage through solid rock.

This quirky curiosity shop takes its cues from the world's bazaars.

The "Seinfeld" diner.

This Los Angeles animation studio is keeping the wonder of stop motion puppetry alive.

This semi-secret garden in south Seattle emulates a traditional Japanese garden using the plants of the Pacific Northwest.

Mysterious 500-year-old tapestries depict a unicorn hunt.