The now-abandoned tunnels were built for the transcontinental railroad on the route where the first wagon train entered California.

A strange mishmash of ruins and abandoned structures hint at the park's many lives.

Founded by members of the Tohono O’odham Nation, this one-room joint's James Beard–winning fry bread is light as a cloud.

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

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

An Arizona museum with a collection of pharmaceutical oddities, including a jar of a gangster's chewed gum.

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

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

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

This golf ball–shaped former desert real estate office now houses a UFO museum.

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

This towering volcanic plug stands out among the dramatic formations that dot this otherworldly desert valley.

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

Giant pinnacles in the sun-scorched lands of Southern Utah have been nicknamed "white ghosts."

Rippling sand dunes frozen in the Arizona rock.

The remains of this hell for leather wild west town can still be found in the Arizona desert.

This reclusive Hopi village in Arizona has been continuously populated longer than anywhere else in America.

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

The graffiti-covered ruins of an abandoned trading post in the middle of the Navajo Nation.

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

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

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

In a 345-million-year-old cave that's 200 feet underground, dinner awaits.

A classic Route 66 landmark that was built with scrap lumber and is held together with kitsch and puns.