Most-visited and most-photographed slot canyon in the American Southwest.

Dramatic river bend surrounds a natural red-rocked pedestal.

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

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

Gleaming self-built castle towers made from beer cans and inspired by "Vitamin Mary Jane."

This small piece of railroad history sits behind the parking lot of a chain grocery store.

A roadside attraction filled with an astounding array of gloriously wacky vehicles.

When ecosystems collide in the arid Southwest.

Unlike most arches, this geological oddity formed in a volcanic dike.

An antique narrow gauge railway line still running through the Colorado and New Mexico mountains.

The most powerful laboratory radiation source in the world pulses with 1,000 times the electricity of a lightning bolt.

This volcano rises like a giant anthill from the plains below, with a road spiraling up to the rim.

The fictional star of "Breaking Bad" is memorialized with a real-life gravestone in his hometown.

This is one really big nut.

The official atomic museum of the United States explores the explosive and productive history of a much maligned energy source.

A cave's rare beauty held a cavernous secret hidden underground.

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

If drivers cross the rumble strip on this stretch of Route 66 at just the right speed it plays "America the Beautiful."

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

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

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

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

The world's first commercial spaceport is a disappointment of cosmic proportions.