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

The biggest solar telescope in the world helps reveal the secrets of our sun.

Take a monster truck tour around an ostrich farm in the middle of the desert.

Hidden inside this Arizona fast food franchise is an in-depth exhibit on the famed WWII counterintelligence program.

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

This reclusive Hopi village in Arizona has been continuously populated longer than anywhere else in America.

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

A geological mystery on Camelback Mountain.

A Wild West jailhouse that slid down the mountainside.

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

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

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

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.

An artificial crater field that trained astronauts for lunar exploration.

Open since 1938, this diner has kept its fountain, malt machine, and all the gum that greasers left beneath its counter.

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

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

Witnessing the might of this dessert-colored desert waterfall is a rare, powerful treat.

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.

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

What is the Thing?

The world's largest military aircraft cemetery.