A geological mystery on Camelback Mountain.

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

This public square capitalized on a single Eagles reference to bring some life back to an Arizona town.

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

This giant steer-skull edifice refuses to die.

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

This rustic cabin, outfitted with gun slits, was once home to John D. Tewksbury, patriarch of the bloodiest family feud in American history.

This collection of Wild West movie memorabilia also claims to hold some secrets of the Lost Dutchman's mine.

In Tucson a giant metal snake helps pedestrians cross a busy highway.

A mysterious spirit totem at the edge of Navajo lands.

Thousands of Mexican Free-Tailed Bats soar around an abandoned storm drain at sunset each summer.

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

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

This Arizona observatory is famous for investigations into Martian life, and as the place humans first spotted Pluto.

An urban laboratory.

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.

A spiritual vortex among the red rocks in Sedona.

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

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

The Magical World of George Phar Legler.

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

A reproduction of earth's many biomes.

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