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

Collection of vintage trailers double as hotel rooms.

The world's largest military aircraft cemetery.

A motel dedicated to Southwestern nostalgia.

A nature and cultural preserve named for its multitude of petroglyphs carved by the Northern Sinagua people.

The story of Two Guns, Arizona could easily be described as a Shakespearian tragedy on Route 66.

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

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

On the outskirts of a reborn ghost town, a decaying post office remembers the bad old days.

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

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

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

A stealthy Apache hideaway that became the haunting site of a mass grave.

This historic national park is covered in the stunning ruins of red rock pueblos.

America's only nuclear missile silo open to the public.

One of the largest, oldest, darkest, quietest motel rooms in the world.

An homage to everyone's favorite prehistoric cartoon family.

An arsenic-filled pool in the Grand Canyon takes on the appearance of a giant, overflowing pumpkin.

See massive fossils that are over 200 million years old in northeastern Arizona.

This secluded aqua waterfall in the Grand Canyon is the perfect swimming hole, and the Havasupai tribe's fiercely protected natural wonder.

Most-visited and most-photographed slot canyon in the American Southwest.

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

The oldest extant wooden jail in South Dakota and possibly the United States. 

More than 7,000 gallons of water pour over these cascading red quartzite waterfalls every second.