One of the most extensive and well-preserved collections of dinosaur footprints in North America.

This isolated outpost was once the only place to cross the Colorado River for hundreds of miles.

This huge dam across the Colorado River caused an armed standoff between two U.S. states.

Although now a decaying ruin, this stone cabin's history includes several notable figures.

This ancient trail has claimed the lives of over 2,000 people.

This oasis-like spring in the Sonoran Desert is home to unique, endangered species.

These mid-century motels once housed the workers who built the Glen Canyon Dam.

The largest and most well-preserved petroglyph site in the Verde Valley.

An off-the-beaten path cave with an underground lake.

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

This old selenite mine is dotted with tiny crystals that make it shimmer like it's covered in glitter.

A former department store turned into a quirky restaurant.

A small canyon with petroglyphs and a seasonal waterfall, only a short hike from the remnants of old Route 66.

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

Bootleggers ran booze beneath this building before (and after) Route 66 appeared beside it.

A geological mystery on Camelback Mountain.

For those going through a life transition, a place to leave behind a piece of your former self.

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

A Wild West jailhouse that slid down the mountainside.

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

This giant steer-skull edifice refuses to die.

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

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

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