Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

The Magical World of George Phar Legler.

Ancient pueblos built into the base of a natural canyon wall.

A self-built castle made by a mysterious man.

The unusual burial monument of Arizona's first governor.

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

In the remote high desert of New Mexico, a strange array of poles beckon fury from above.

A phenomenal assembly of pueblos in New Mexico is the most complete example of ancient ruins north of the border.

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

These Pre-Columbian petroglyphs contain representations of birds, deer, hunters, and even some early Native flute players.

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

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

This giant steer-skull edifice refuses to die.

The world's largest military aircraft cemetery.

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

Some of the tallest ancient American ruins continue to inspire awe and curiosity.

The installation’s official name, “You Who Are Getting Obliterated in the Dancing Swarm of Fireflies,” says it all.

Under the right circumstances, this waterfall in Yosemite briefly turns a luminescent fiery orange.

Towering basalt columns, a creation of fire and ice.

An emerald-green grotto just a short trip from Austin.

Rippling sand dunes frozen in the Arizona rock.

Dramatic river bend surrounds a natural red-rocked pedestal.

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

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