This Old West prison built into the side of a cliff was said to be inescapable.

The massive, incredibly rare instrument is over 11 feet tall with a range so deep it goes lower than humans can hear.

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

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

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

A once popular resort—said to be the vacation spot of gangster Al Capone—now remains abandoned in the woods of Arizona.

More than 300 years ago, a revolt at this Hopi pueblo shaped the future of the American Southwest.

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

A Wild West jailhouse that slid down the mountainside.

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

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

Legend says train robbers stashed their gold within the depths of this unusual cave.

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

A mysterious spirit totem at the edge of Navajo lands.

Don't blink or you'll miss it.

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

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

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

All of the 20 occupied houses in this mostly abandoned town feature some curious display of junk art.

Collection of vintage trailers double as hotel rooms.

This vast kitty-themed collection illustrates the history of human-cat interaction.

Hidden amid a collection of trails is the site of a tragic crash.

Enormous lake at the bottom of a unique cave system.

This large cave is a summer home to thousands of bats and has a rich history dating back to prehistoric times.