Limestone caves with spectacular showcase chambers.

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

The story of Two Guns, Arizona could easily be described as a Shakespearian tragedy on Route 66.

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

A working cattle ranch with remarkably well-preserved prehistoric petroglyphs and ancient ruins.

A spiritual vortex among the red rocks in Sedona.

America's only nuclear missile silo open to the public.

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

A stealthy Apache hideaway that became the haunting site of a mass grave.

Witnessing the might of this dessert-colored desert waterfall is a rare, powerful treat.

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

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

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

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

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

In a 345-million-year-old cave that's 200 feet underground, dinner awaits.

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

Dramatic river bend surrounds a natural red-rocked pedestal.

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

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.

Rippling sand dunes frozen in the Arizona rock.

A Native American petroglyph, the site of an emigrants' waystation, and the ruins of an early 20th-century sheep camp are all found at this crossroads.

An abandoned early 20th-century gold mine in a spectacular setting overlooking Bridgeport Valley and the Sierra Nevada.