One of the most extensive and well-preserved collections of dinosaur footprints in North America.

An improbable waterfall springs from an orange-white cliff face, tumbling into the headwaters of the Virgin River above Zion National Park.

This mesmerizing and surreal landscape features intricate patterns of white and red sandstone.

Rippling sand dunes frozen in the Arizona rock.

Nature has shaped this drainage tunnel into the digestive tract of a mighty beast.

Colorful sand dunes create a unique attraction in this part of Utah's red-rock country.

A volcanic tunnel illuminated by natural skylights offers a shaded respite from the desert sun.

An eatery for UFO seekers on the Extraterrestrial Highway.

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.

This sign designates the road that leads to the infamous Area 51.

This sculpture garden in Death Valley makes you feel like you've slipped into some alternate reality.

Water of undetermined depth has attracted rare fish and cult leaders alike.

One of the largest, oldest, darkest, quietest motel rooms in the world.

Settled by the Church of Jesus Christ of Latter-day Saints in 1859, this abandoned frontier town has appeared in several films.

A picture-perfect town, perfect for blowing up.

Many believe these images represent interstellar lifeforms.

One of the few remaining indigenous petroglyph sites in Nevada.

Mysterious meeting place for UFO hunters near Area 51.

If you want to take a peek at Area 51, this is legally as close as you're going to get.

The self-proclaimed gateway to the Extraterrestrial Highway.

An unexpected sinkhole in a desert flat within Gold Butte National Monument.

A tunnel with windows, so you don't miss out on the impressive views.

This secluded aqua waterfall in the Grand Canyon is the perfect swimming hole, and the Havasupai tribe's fiercely protected natural wonder.

The highest concentration of petroglyph sites in Gold Butte National Monument, plus an improbable early 20th-century dam.