This pebble beach is so beautiful that taking its rocks is against the law.

Operational for less than a year, this mill produced more than 11,000 tons of chrome concentrate in its short lifespan.

The world's largest mineral hot springs is home to a herd of bison, a free public bath house, beautiful mineral formations, and a terrifying swinging bridge.

The first declared National Monument in the United States.

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

Steep canyon walls hide a forested oasis in the West Texas desert.

One man's ambition created this psychedelic log home.

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

Named after an outlaw who used the basin as a hideout.

The drama of nature in full effect in this Nevada State Park.

A planet-hunting astrograph built in the 1920s to seek out the so-called "Planet X" beyond Uranus.

The final resting place of the businessman-turned-astronomer who helped discover Pluto stands near his observatory.

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

This historic national park is covered in the stunning ruins of red rock pueblos.

This small interfaith chapel lies not far from the rim of the Grand Canyon.

This Native American settlement dates back to the Pueblo II period.

The location where the iconic movie character declared it was time to go home.

Red sandstone structures dominate this landscape, which has been inhabited for some 5,000 years.

See massive fossils that are over 200 million years old in northeastern Arizona.

This public square capitalized on a single Eagles reference to bring some life back to an Arizona town.

Ancient pueblos built into the base of a natural canyon wall.

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

This 40-room dwelling tucked within a cliff was built by the basin's prehistoric residents.

Some of the tallest ancient American ruins continue to inspire awe and curiosity.