See massive fossils that are over 200 million years old in northeastern Arizona.

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

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

Dramatic river bend surrounds a natural red-rocked pedestal.

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

Rippling sand dunes frozen in the Arizona rock.

The shattered remnants of a meteor that struck Santa Fe more than a billion years ago.

More than 21,000 images fill this overlooked gem of a prehistoric site.

Wee (and not so wee) footprints that insects and reptiles of the Paleozoic Era left behind.

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

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

A multi-storied adobe complex has been inhabited for more than a thousand years.

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

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."

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

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.

One of the world’s largest cave systems houses legends, concerts, and wondrous rock formations alike.

Take a dip beneath the stalactites in this amazing cenote.

Found down a long dirt road, a sacred Mexican cenote and 18th-century hacienda remain hidden.

This series of waterfalls tumble into a radiantly blue river.

It's believed this golden brick is part of the legendary lost Aztec treasure.

The ruins of a former sanctuary for elite Aztec warriors.

Three small rooms in the jungle house the most elaborate and intact murals of the Mayan world.