Rippling sand dunes frozen in the Arizona rock.

This historic national park is covered in the stunning ruins of red rock pueblos.

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

A nature and cultural preserve named for its multitude of petroglyphs carved by the Northern Sinagua people.

The largest and most well-preserved petroglyph site in the Verde Valley.

A spiritual vortex among the red rocks in Sedona.

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

A self-built castle made by a mysterious man.

Thousands of Mexican Free-Tailed Bats soar around an abandoned storm drain at sunset each summer.

Founded by members of the Tohono O’odham Nation, this one-room joint's James Beard–winning fry bread is light as a cloud.

Three hundred years of preserved Spanish colonial history in San Antonio.

On a dusty county road sit the ruins of a ghost town's abandoned church.

An Idaho legend carved out a cave village with his own two hands.

This set of hot springs also comes with fantastic views.

A few dilapidated structures are all that remain of this deserted former silver mining town.

This town is home to the world’s largest arch constructed entirely of elk antlers.

One man's ambition created this psychedelic log home.

Native Americans built this circle of stones, which was used to predict astronomical events.

The remote outlaw hideout of Jesse James, Butch Cassidy, and the Sundance Kid.

Unlike many reclaimed, abandoned mines, this Canadian cave system is still just a dangerous maze.

Sitting empty in a lonely Canadian field is a century-old stone bunker sometimes called "One Man's Castle."