This Arizona observatory is famous for investigations into Martian life, and as the place humans first spotted Pluto.

Ancient pueblos built into the base of a natural canyon wall.

The world's only teal arches exist in a city that cares more about its aesthetic than an Instagram influencer.

A spiritual vortex among the red rocks in Sedona.

One of the final grand railway depot hotel complexes is slowly being restored to its former glory.

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

These ruins of a pre-Columbian cliff village are among the most beautiful and well preserved in New Mexico.

Every year, festive decorations appear on this juniper tree located in the median strip of a busy highway.

The largest natural travertine bridge in the world is nestled in a small canyon in central Arizona.

A geological mystery on Camelback Mountain.

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

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

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

Come for the pizza, stay for a performance on the world's largest theater pipe organ.

The former home of the army detachment that captured Geronimo.

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

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

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.

The "Father of Arizona" tried to build a Zoroastrian fire temple on the hill where he's now buried.

Limestone caves with spectacular showcase chambers.

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

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

This giant steer-skull edifice refuses to die.