A partial tunnel blasted into a steep ridge is all that remains of a failed railway across Arizona.

A nature and cultural preserve named for its multitude of petroglyphs carved by the Northern Sinagua people.

The cinder cone volcano with a less than complimentary name.

The remains of this hell for leather wild west town can still be found in the Arizona desert.

A pair of giant roadside arrows are all that remains of a former Route 66 trading post.

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

Along the old Route 66 is an abandoned trading post made from old telephone poles, built by a former circus clown.

The wreckage of a deadly bomber plane crash can still be found near an Arizona peak.

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

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

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

A mysterious "wedding cake" castle in the middle of the urban desert.

A mysterious spirit totem at the edge of Navajo lands.

Once the product of an inexplicable gold strike, this ghost town is now home to one man and his love of classic machines.

Walk through the actual strap iron cells and solitary chambers of Arizona Territory’s first prison.

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

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

An artificial crater field that trained astronauts for lunar exploration.

Don't blink or you'll miss it.

This golf ball–shaped former desert real estate office now houses a UFO museum.

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

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

This striking public art installation is suspended above a public park, designed to gently move in the breeze.

Limestone caves with spectacular showcase chambers.