A geological mystery on Camelback Mountain.

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

This collection of neon icons is preserving Arizona's history, one sign at a time.

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

The eroded core of an ancient volcano is now accessible by a short hike.

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

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

This giant steer-skull edifice refuses to die.

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

A secret fresh water spring for animals and humans alike hidden along the most famous road in the United States.

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

The highest point in Arizona is an oddly snow-topped peak within the otherwise arid state.

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

A living snapshot of a different time in America is preserved and maintained by a community of volunteers.

This southwestern historic site was designed and built by an artist who wanted his work to "feel at home."

A natural history wunderkammer in the middle of the desert.

One of the world's largest telescopes, stares into the night sky with two huge mirrors.

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

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

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

A mysterious spirit totem at the edge of Navajo lands.

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

An artificial crater field that trained astronauts for lunar exploration.

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