Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

A self-built castle made by a mysterious man.

The installation’s official name, “You Who Are Getting Obliterated in the Dancing Swarm of Fireflies,” says it all.

This striking public art installation is suspended above a public park, designed to gently move in the breeze.

A sprawling collection of over 106,000 toys from around the world.

Wedding chapel's mysterious spiral staircase said to be miraculously constructed.

An immersive environment that is part haunted house, part choose-your-own-adventure, and part jungle gym.

This popular pilgrimage site offers a hole filled with holy healing dirt.

One man has carved a number of natural New Mexico caves into psychedelic sandstone temples.

A 16th-century horror show built in a lovely Italian garden.

A mysterious and terrifying public art goblin seemingly meant to inspire local legend.

After a profound show of devotion for his master, a dog becomes the symbol of loyalty for an entire nation.

Shrine to Japanese water-goblins, complete with their preserved body parts.

An abandoned horticulture institute gloomily presides over rows of derelict and vine-wrought greenhouses.

The only structure left with direct ties to the Salem witchcraft trials of 1692.

The giant scales in this museum can still tell if someone is one of the devil's brides just by weight.

Experience the hysteria of a 17th century witch hunt through goofy reenactments and wax dummies that should probably be burned at the stake.

Statue in Salem of the woman who starred as the witch Samantha in the sitcom "Bewitched."

Mysterious meeting place for UFO hunters near Area 51.

An unfortunate geological resemblance to Satan has labeled this Pasadena gorge as a passage to the underworld.

The headquarters of the Fraternitas Rosae Crucis, complete with Rosicrucian pyramids, all in the Pennsylvania woods.

A park full of outsider art, created by college students studying outsider art.

Town full of spiritualists, some of whom are mediums, is still in full swing after 130 years.

An extravagant western hotel where every floor is the "ground floor."