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

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

The world's largest military aircraft cemetery.

Some of the tallest ancient American ruins continue to inspire awe and curiosity.

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

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

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

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 reproduction of earth's many biomes.

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."

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

A sharp bend in a dramatic river canyon cut through red rocks.

Rippling sand dunes frozen in the Arizona rock.

The world's largest rose bush has literally outgrown the pioneer museum it was planted behind.

An old saloon in the West filled with history, and according to some, a few dozen ghosts.

Stairs often replace streets on the steep slopes of this old mining town.

San Diego's most historic and haunted home.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

Get fishing gear and craft beer at this restaurant on the pier.

Not truly a ship nor a building, the Navy's first and last "landship" is now abandoned due to clerical issues.