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

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

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.

Every Christmas, one Arizona city makes the most of its dry climate by creating an arid desert tannenbaum.

A $100,000 tumbleweed decorates an Arizona park and ride that got its priorities a bit tangled.

The historic “pink house on the hill” is an architectural gem that now serves as a center for water conservation.

The unusual burial monument of Arizona's first governor.

A museum and tribute to a brave profession.

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

A geological mystery on Camelback Mountain.

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

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

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

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

A former department store turned into a quirky restaurant.

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

The Zalud family experienced a number of tragedies in one decade, giving rise to rumors that the 19th century house is haunted.

A B-17 bomber stands as a memorial to the residents of Tulare County who served in World War II.

A 19th-century cabin built into a hollowed-out Sequoia tree.

This hidden fire lookout offers spectacular views of Sequoia National Park.

These millipedes glow not out of attraction, but as a not-too-subtle warning.

Four hundred granite steps were built into this massive rock by the National Park Service.

Quite simply the largest tree in the world (by volume).