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

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

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

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

A mysterious spirit totem at the edge of Navajo lands.

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

In Tucson a giant metal snake helps pedestrians cross a busy highway.

Walk through the actual strap iron cells and solitary chambers of Arizona Territory’s first prison.

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

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

An artificial crater field that trained astronauts for lunar exploration.

One of the world's largest telescopes, stares into the night sky with two huge mirrors.

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

Don't blink or you'll miss it.

The fading, forgotten remains of a once bright and booming factory.

Thousands of Mexican Free-Tailed Bats soar around an abandoned storm drain at sunset each summer.

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

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

Collection of vintage trailers double as hotel rooms.

What is the Thing?

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

An urban laboratory.

The world's largest military aircraft cemetery.

Limestone caves with spectacular showcase chambers.