The unusual burial monument of Arizona's first governor.

A wild west cemetery in Tombstone, Arizona, provides a window into the Old West.

What is the Thing?

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

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

The largest natural travertine bridge in the world is nestled in a small canyon in central Arizona.

These free-roaming horses were once destined to disappear from the land.

This popular pitstop lives up to its name.

Twenty-seven massive radio antennas on the high plains of New Mexico search for life on other planets.

Twice a year, visitors can tour the desolate site that birthed the Atomic Age.

A tunnel with windows, so you don't miss out on the impressive views.

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

Mysterious meeting place for UFO hunters near Area 51.

An eatery for UFO seekers on the Extraterrestrial Highway.

In the middle of an extremely unforgiving and desolate high desert is the most secret military facility in the world.

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

Activists are fighting to preserve these unfinished highway ramps as a tribute to the citizen revolt that halted their construction decades ago.

A town's monument to a touch-football victory 50 years in the making.

This metallic stampede sits frozen on a Washington ridge yet the artist's vision is still incomplete.

Nuclear reactor created the plutonium used on Nagasaki.

This playground sculpture of an icon from the past is dedicated to the children of the future.

This famous bridge twisted itself into oblivion, but not for the reason you might think.

This Cold War missile launch site has been abandoned for 40 years.

Site of the greatest known waterfall that ever existed.