The site of Billy the Kid’s most famous escape and the end to the Lincoln County War.

This innocuous New Mexico storefront was once the secret jump-off spot for Manhattan Project scientists.

Some 2,000 carvings show this rare desert spring has been an oasis for travelers for over a thousand years.

This volcano rises like a giant anthill from the plains below, with a road spiraling up to the rim.

This quirky hot springs town known to locals as "T or C" was named after a radio show.

"I did this all while you were watching TV."

A small metropolis of Pueblo cave dwellings have been carved right into the hillside of this national monument.

This is one really big nut.

Twice a year, visitors can tour the desolate site that birthed the Atomic Age.

Legends surround this jagged rock formation in the New Mexico desert.

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

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

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

This Arizona observatory is famous for investigations into Martian life, and as the place humans first spotted Pluto.

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

Dramatic river bend surrounds a natural red-rocked pedestal.

This mill has survived a tumultuous past to still produce flour and cornmeal.

Learn all about this iconic air rifle without putting an eye out.

A short boardwalk through a swamp leads to the spot from which the Louisiana Purchase was surveyed.

A large stone map of Arkansas awaits visitors to its highest point.

This historic hotel on Bathhouse Row in Hot Springs National Park has a storied history of gangsters and baseball greats.

This haunted hotel built on natural springs once served as a hospital for a quack doctor promising a cure for cancer.

The only diamond mine in the world where you can keep what you find.

This futuristically sylvan church is a glass-enclosed marvel of modern architecture.