These aggressively sustainable art homes look like something out of 1970's science fiction.

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

A museum dedicated to the alleged Roswell Incident.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

Seemingly grown on some other world, these New Mexico rock formations look like a disused science fiction set.

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

The land is full of geologic eye candy, such as otherworldly spires, mushroom-shaped hoodoos, and prehistoric fossils.

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

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

The oldest Italian café in Boston, this spot also serves as a veritable museum of vintage coffee ephemera.

The oldest still-operating tavern in the United States was once owned by a pirate.

A crumbling stone stable and carriage house are all that remain of a manse that was once filled with Egyptian artifacts.

The exact whereabouts of this surreal cabinet of curiosities are rarely the same place twice.

An unusual library of dead things at the Rhode Island School of Design.

A virtually untouched "home on the hill" for the flora and fauna of Rhode Island.

This 3,500 pound obelisk was constructed with more than 1,000 reclaimed guns.

Rumors of the occult haunt this upscale 1920s hotel.

An architectural statement of artistic intent smack in the middle of Providence, Rhode Island's Colonial uniformity.

Books bound in human skin and H. P. Lovecraft's letters are among a few of the treasures this library has to offer.

Final resting place of one of the classic authors of horror literature.

Last residence of H.P. Lovecraft featured in his story "The Haunter of the Dark."

A 19th century library favored by Edgar Allan Poe and H.P. Lovecraft, known by locals as "the Ath."

Artifacts of whaling, with both its perils and adventure, are housed in this museum in a former candle factory.

The mansion home of author Edith Wharton.