A motel dedicated to Southwestern nostalgia.

On the outskirts of a reborn ghost town, a decaying post office remembers the bad old days.

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

This reclusive Hopi village in Arizona has been continuously populated longer than anywhere else in America.

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

This isolated outpost was once the only place to cross the Colorado River for hundreds of miles.

A geological mystery on Camelback Mountain.

A nature and cultural preserve named for its multitude of petroglyphs carved by the Northern Sinagua people.

Along the old Route 66 is an abandoned trading post made from old telephone poles, built by a former circus clown.

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

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

A Tucson museum and performance space full of found-object movable sculptures.

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

In a 345-million-year-old cave that's 200 feet underground, dinner awaits.

A working cattle ranch with remarkably well-preserved prehistoric petroglyphs and ancient ruins.

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

Witnessing the might of this dessert-colored desert waterfall is a rare, powerful treat.

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

Limestone caves with spectacular showcase chambers.

A spiritual vortex among the red rocks in Sedona.

This historic national park is covered in the stunning ruins of red rock pueblos.

America's only nuclear missile silo open to the public.

A stealthy Apache hideaway that became the haunting site of a mass grave.