An urban laboratory.

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

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

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

This abandoned horse racing track was an exercise in hubris from its inception.

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

A self-built castle made by a mysterious man.

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

The unusual burial monument of Arizona's first governor.

A museum and tribute to a brave profession.

In this small Phoenix taxidermy emporium, you can find everything from a squid in a jar to a freeze-dried toad.

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

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

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

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

A geological mystery on Camelback Mountain.

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

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.