An abandoned facility that has become a place of ritualistic satanic worship, or so rumor has it.

A stealthy Apache hideaway that became the haunting site of a mass grave.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

The wreckage of a deadly bomber plane crash can still be found near an Arizona peak.

An artificial crater field that trained astronauts for lunar exploration.

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

A self-built castle made by a mysterious man.

On the outskirts of a reborn ghost town, a decaying post office remembers the bad old days.

Once the product of an inexplicable gold strike, this ghost town is now home to one man and his love of classic machines.

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

This collection of Wild West movie memorabilia also claims to hold some secrets of the Lost Dutchman's mine.

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

An urban laboratory.

A towering bronze statue memorializes the founding father of postwar American conservatism.

A phenomenal assembly of pueblos in New Mexico is the most complete example of ancient ruins north of the border.

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

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