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.

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 geological mystery on Camelback Mountain.

A museum and tribute to a brave profession.

A self-built castle made by a mysterious man.

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

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

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.

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

Towering basalt columns, a creation of fire and ice.

Under the right circumstances, this waterfall in Yosemite briefly turns a luminescent fiery orange.

Deliberately hidden for centuries, the magnificent Saadian Tombs were eventually uncovered in 1917.

A museum devoted entirely to the rattlesnakes and snake-related art.

If drivers cross the rumble strip on this stretch of Route 66 at just the right speed it plays "America the Beautiful."

Activists are fighting to preserve these unfinished highway ramps as a tribute to the citizen revolt that halted their construction decades ago.

Residents of Fremont in Seattle have considered it the center of the universe since the 1970s.

42nd story Pyramid shaped penthouse tops Seattle's oldest skyscraper.

This Seattle museum displays the history of the telephone through an impressive collection of telecom equipment.

From a neon Rapunzel to a bike traffic meter to a street fair color scheme, the most opened drawbridge in the US is a veritable art gallery.

The first park built over a freeway is a brutalist masterwork.