Bad farming practices caused this unnatural natural wonder.

Once an ambitious nature spa, these forest ruins now provide a serene monument to failure.

The Grand Canyon of Texas.

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

When ecosystems collide in the arid Southwest.

An arsenic-filled pool in the Grand Canyon takes on the appearance of a giant, overflowing pumpkin.

A sculpture made of 10 Cadillacs as a monument to the "Golden Age" of the American automobile.

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

This geothermal hot spring hides beneath a slowly growing mineral dome.

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

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

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

Seemingly grown on some other world, these New Mexico rock formations look like a disused science fiction set.

A breathtaking array of ancient Pueblo structures and artifacts counterintuitively preserved by neglect.

Odd outsider art installations surround a Gold Rush-era ghost town.

A beautiful geyser under environmental threat.

The first declared National Monument in the United States.

The hike through a narrow river flanked by the 2,000-foot-tall walls of Zion Canyon is one of the best in the world.

A trash dump made beautiful by nature's power.

The land is full of geologic eye candy, such as otherworldly spires, mushroom-shaped hoodoos, and prehistoric fossils.

Here, at the "world's longest art gallery," you'll find forty miles of ancient petroglyphs and pictographs.

Paranormal experiences in this hotel's room 217 led Stephen King to write "The Shining."

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