This sacred cavern, 400 feet deep, is home to millions of bats and an ancient burial ground.

More than 300 years ago, a revolt at this Hopi pueblo shaped the future of the American Southwest.

A partial tunnel blasted into a steep ridge is all that remains of a failed railway across Arizona.

For those going through a life transition, a place to leave behind a piece of your former self.

Come for the pizza, stay for a performance on the world's largest theater pipe organ.

Walk through the actual strap iron cells and solitary chambers of Arizona Territory’s first prison.

This 40-room dwelling tucked within a cliff was built by the basin's prehistoric residents.

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

A motel dedicated to Southwestern nostalgia.

On the outskirts of a reborn ghost town, a decaying post office remembers the bad old days.

Limestone caves with spectacular showcase chambers.

Ancestral Puebloan ruins, natural arches, and box canyons abound in this seldom-visited corner of Monument Valley Navajo Tribal Park.

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.

Despite a legend that says this highest peak in Oregon was climbed in high heels scores of people have died on its slopes.

Formerly secret, precariously perched boulders.

A sculpture of a salmon swimming through a brick building.

This abandoned boat sits on a nude beach, is shaped like a UFO, and is covered in graffiti.

The longest continuous lava tube in Oregon.

Only known mainland rookery of the threatened Stellar sea lion.

The second largest waterfall by volume in the U.S., Willamette Falls is outdone only by Niagara in the amount of water that is pushed northward.

The lush coastal city of Astoria is riddled with forgotten secret sidewalks.