Cross Country

This naturally heated mountainous creek has created a group of neon blue pools of potentially deadly boiling water.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

This naturally-sourced hot spring is now home to a clothing-optional resort.

Sandstone rock formations that look like they belong on the cover of a progressive rock album.

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

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

A clear blue swimming hole with hidden caves, still unexplored.

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

The largest self-built castle in the U.S., six decades in the making.

A piece of outsider public art accompanied by a strange urban legend.

Bizarre lunar-like landscape with thousands of large stone "hoodoos."

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

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

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

A modernist landscape of water and sci-fi concrete.

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

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

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

A picture-perfect town, perfect for blowing up.

The world's longest known cave system.

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

A beautiful geyser under environmental threat.

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

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

Crystal clear lake with a shoreline of travertine located in a Colorado canyon.

The first declared National Monument in the United States.

Wondrous sandstone hoodoos where Native Americans collected clay for pottery, 9,000 years ago.

Towering basalt columns, a creation of fire and ice.

One man has carved a number of natural New Mexico caves into psychedelic sandstone temples.

A collision of human error and natural geothermal pressure created this rainbow-colored geologic wonder.

Dramatic river bend surrounds a natural red-rocked pedestal.

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

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

The world's largest military aircraft cemetery.

Rippling sand dunes frozen in the Arizona rock.

A motel dedicated to Southwestern nostalgia.

One of the world's largest telescopes, stares into the night sky with two huge mirrors.