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

This immigrant bridge once spanned the Thames but is now a fixture of an Arizona city.

A mysterious spirit totem at the edge of Navajo lands.

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

An Arizona museum with a collection of pharmaceutical oddities, including a jar of a gangster's chewed gum.

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

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

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

Collection of vintage trailers double as hotel rooms.

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

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

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

An abandoned facility that has become a place of ritualistic satanic worship, or so rumor has it.

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.

In this small Phoenix taxidermy emporium, you can find everything from a squid in a jar to a freeze-dried toad.