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

In a largely deserted ghost town, a little brick building recalls its history as a gold rush hub and haven for outlaws.

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

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

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

This is one really big nut.

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

These ruins of a pre-Columbian cliff village are among the most beautiful and well preserved in New Mexico.

Recycling meets art in this colorful barricade.

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

Wee (and not so wee) footprints that insects and reptiles of the Paleozoic Era left behind.

European castle ruins in an American state park are actually the product of death and grief.

The highest point in Montana is as rugged and singular as the state itself.

A rapidly disappearing glacier filled with extinct grasshoppers, perfectly preserved in the ice.

Mining town from the late 1890s, once home to Calamity Jane.

For thousands of years, Native American hunters drove buffalo straight off this cliff in Montana's Yellowstone Country.

See the computer’s history revealed over the course of 20,000 years.

Hidden behind Lincoln's head is a 70-foot-long chamber containing enamel plates documenting American history, sealed in a teakwood box in a titanium vault.

Once thought to be the oldest living tree in the world, Methuselah was germinated before the Egyptian pyramids were built.

The echoes of a railroad town that solemnly mark the end of the line.

A charming desert roadside bakery that produces 10 times more bread daily than it has residents in its town.

Towering basalt columns, a creation of fire and ice.

This naturally heated mountainous creek has created a group of neon blue pools of potentially deadly boiling water.

Eons old volcanic activity created one of the most stunning rock formations in the United States.