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

Florence's historic adobe county courthouse was turned into a historic site that honors one of Arizona's most prominent political leaders.

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

This collection of vintage signs reflects the long and colorful history of this Arizona town.

A lingering bit of Space Race nostalgia lies in the middle of the desert.

Opinions differ as to whether this Arizona tree was actually used as a Wild West jail, but that hasn't stopped the town from capitalizing on it.

A giant mascot, a car bomb, and the mafia mingle in the history of a defunct restaurant chain.

Once a year, at exactly 11:11 a.m., this monument comes to life.

The unusual burial monument of Arizona's first governor.

The exit of the largest prisoner-of-war escape attempt on American soil during World War II.

A historic hydroelectric power plant serves as the unusual backdrop for a public park.

The massive, incredibly rare instrument is over 11 feet tall with a range so deep it goes lower than humans can hear.

A towering bronze statue memorializes the founding father of postwar American conservatism.

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

This striking public art installation is suspended above a public park, designed to gently move in the breeze.

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

The installation’s official name, “You Who Are Getting Obliterated in the Dancing Swarm of Fireflies,” says it all.

Artifacts from a battleship sunk at Pearl Harbor displayed in the Capitol building of its namesake.

The first permanent memorial to a unique secret weapon of World War II.

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

Once a dining hall for boarding school students, this lodge was a popular haunt for nuclear physicists working on the Manhattan Project.

This museum started as a collection of Manhattan Projects and continues to add exhibits as they are declassified.

A small metropolis of Pueblo cave dwellings have been carved right into the hillside of this national monument.

A small side chapel in Santa Fe's basilica is home to the oldest statute of the Virgin Mary in North America.