A geological mystery on Camelback Mountain.

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

A self-built castle made by a mysterious man.

The unusual burial monument of Arizona's first governor.

A stone pillar commemorates the surrender of the extraordinary Apache leader.

The largest copper mine in Arizona, this enormous open pit emerges from the hills like an alien landscape.

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

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.

Hike the unusual hoodoos and rock formations that form this little-known natural wonder.

Collection of vintage trailers double as hotel rooms.

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

Stairs often replace streets on the steep slopes of this old mining town.

An old saloon in the West filled with history, and according to some, a few dozen ghosts.

The world's largest rose bush has literally outgrown the pioneer museum it was planted behind.

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

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

What is the Thing?

At an isolated roadside rest area stands a monument marking where famous Western star Tom Mix died in 1940.

A stone pillar marking the location of the westernmost battle of the American Civil War only honors one side of the conflict.

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.

This giant steer-skull edifice refuses to die.

After a short-lived attempt to bring America in line with the rest of the world, this road was left in metric.