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

A multi-storied adobe complex has been inhabited for more than a thousand years.

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

A burnt-out motel with priceless Native American artwork in the basement, redeveloped into apartments.

A museum dedicated to the alleged Roswell Incident.

This fast-food outlet is the only space and UFO-themed McDonalds in the world.

Home of the International Space Hall of Fame.

This is one really big nut.

A giant "X" symbolizes the blood spilled from the brutal Juárez drug wars.

A Prada store in the West Texas desert that is never open for business.

A spring-fed pool so deep it's used for scuba diving as well as swimming.

A Texas cave network is home to some of the world's most spectacular-looking and bizarrely named mineral formations.

Continuing the tradition of the dime museum in style.

One part antique store, one part curiosities hodge-podge.

A private collection of massive steel monsters guarding a Texas pipe works.

A 19th-century Gothic, castle-like statehouse by the Mississippi River.

Pensacola's UFO home has withstood many hurricanes—just as the experimental 1960s design intended.

This 15-foot former Johnny Appleseed has given up his apples for donuts and coffee.

A luxurious 1880s hotel with its fair share of Tiffany stained glass, Edison electricity, and of course, ghosts.

This curio museum seems like the type of place you might find a mogwai or a monkey's paw.

It's a pretty creepy lock-up.

A tribute to Ponce de Leon's supposed quest for eternal youth.

St. Augustine's record-setting narrow street was designed to protect against pirates.

The ruins of this antebellum sugar plantation are the end result of a Seminole attack during the Florida Wars of 1836.