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

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

A motel dedicated to Southwestern nostalgia.

A classic Route 66 landmark that was built with scrap lumber and is held together with kitsch and puns.

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

Limestone caves with spectacular showcase chambers.

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

A spiritual vortex among the red rocks in Sedona.

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

A Saint Nicholas-themed ghost town in the Mojave desert.

Ancestral Puebloan ruins, natural arches, and box canyons abound in this seldom-visited corner of Monument Valley Navajo Tribal Park.

An arsenic-filled pool in the Grand Canyon takes on the appearance of a giant, overflowing pumpkin.

Eons ago, a rushing lava river formed this pristine passage through solid rock.

See massive fossils that are over 200 million years old in northeastern Arizona.

A reproduction of earth's many biomes.

Dramatic river bend surrounds a natural red-rocked pedestal.

One of the largest open-pit copper mining operations in the entire country.

The largest and most well-preserved petroglyph site in the Verde Valley.

This Route 66 classic sports a giant fiberglass rabbit that you can ride.

This memorial includes fragments from one of the greatest tragedies in United States history.

One of the final grand railway depot hotel complexes is slowly being restored to its former glory.

This public square capitalized on a single Eagles reference to bring some life back to an Arizona town.

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

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