These mid-century motels once housed the workers who built the Glen Canyon Dam.

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.

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

A geological mystery on Camelback Mountain.

A pair of giant roadside arrows are all that remains of a former Route 66 trading post.

This immigrant bridge once spanned the Thames but is now a fixture of an Arizona city.

This giant steer-skull edifice refuses to die.

The eroded core of an ancient volcano is now accessible by a short hike.

The highest point in Arizona is an oddly snow-topped peak within the otherwise arid state.

This collection of Wild West movie memorabilia also claims to hold some secrets of the Lost Dutchman's mine.

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

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

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

A mysterious spirit totem at the edge of Navajo lands.

In Tucson a giant metal snake helps pedestrians cross a busy highway.

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.

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

The largest natural travertine bridge in the world is nestled in a small canyon in central Arizona.

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

Ancient pueblos built into the base of a natural canyon wall.

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

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