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.

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

This rugged area of red rocks and arches is often considered one of the most beautiful places on Earth.

Giant pinnacles in the sun-scorched lands of Southern Utah have been nicknamed "white ghosts."

Rippling sand dunes frozen in the Arizona rock.

The artist James Turrell is repurposing an extinct volcano crater as an observatory to experience the cosmos.

Eons ago, a rushing lava river formed this pristine passage through solid rock.

The cinder cone volcano with a less than complimentary name.

Dramatic river bend surrounds a natural red-rocked pedestal.

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

Strange red rock formations that have been attributed to a higher power for hundreds of years.

These faux-cliff dwellings allow visitors to climb around on a replica archaeological site.

The largest source of fossilized insects anywhere.

Ancestral Puebloan ruins, natural arches, and box canyons abound in this seldom-visited corner of Monument Valley Navajo Tribal Park.

Silver in the hills led to the speedy creation of this boom town and a lack of it saw the town abandoned nearly as quickly.

The haunted reputation of these abandoned Colorado train tunnels is probably not helped by the terrifying spiked fence.

Hidden beyond a kitschy giant beetle is this remarkably sprawling collection of preserved insects.

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

These ruins of a pre-Columbian cliff village are among the most beautiful and well preserved in New Mexico.

This Colorado hiking trail provides a small gold mine of abandoned gold mines.

Home of the International Space Hall of Fame.

This is one really big nut.

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

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