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

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

A world-class observatory in the California desert.

An abandoned quicksilver mining town surrounded by the Big Bend parks.

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

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

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

The world's longest known cave system.

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

The deepest lake in the United States, and once the site of epic destruction that lives on in legends.

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

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

Aqueducts have dramatically changed this old lake, now home to tufa towers and its very own species of tiny brine shrimp.

Towering basalt columns, a creation of fire and ice.

An abandoned movie set in the desert of West Texas.

Natural catch-basin rocks covered in thousands of drawings spanning many millennia.

Modern technology and live displays tell the story of the Pacific during WWII for the Internet generation.

This historic hotel invented the chocolate brownie.

The palatial McDonald's that inspired Wesley Willis.

The unluckiest U-boat in the entire German fleet is now on display in a Chicago museum.

These pretty kitties killed and ate as many as 135 railway workers.

This monument on Breed's Hill proves that one of the most famous battles of the Revolutionary War is misnamed.

Berthed at the Charlestown Navy Yard in Boston, "Old Ironsides" is the oldest commissioned warship still afloat.

Only hotel where you can legally launder money.