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

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

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.

Despite a legend that says this highest peak in Oregon was climbed in high heels scores of people have died on its slopes.

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

A roaring, awe-inspiring double cascade of icy water flows through woodland Oregon like something out of a Tolkien novel.

These markers are used to document elevation changes around the famed dam.

These markers are used to determine the ground stability of the Strip.

A Norwegian-born sculptor created these soaring guardian angels at the entrance to Hoover Dam.

A brothel nestled amongst ghost towns, with an abandoned plane wreck to greet you.

In the middle of an extremely unforgiving and desolate high desert is the most secret military facility in the world.

The highest bridge in America was built for an almost unnervingly small amount of money.

After a short-lived attempt to bring America in line with the rest of the world, this road was left in metric.

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

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

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

Dramatic river bend surrounds a natural red-rocked pedestal.

The world's longest known cave system.

These chunky stone towers out in Lake Michigan are the key to Chicago’s drinking water.

Once called the "Polish Gold Coast" it is an icon of the neighborhood that bears its same name.

To find the "unicorns of the deep" you've got to go downstairs.

"We Seceded Where Others Failed."

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