A river runs through this remote valley in a very unexpected way.

A monument to the one-armed geologist who led the first documented expeditions through the Grand Canyon.

Rippling sand dunes frozen in the Arizona rock.

This small interfaith chapel lies not far from the rim of the Grand Canyon.

These elusive, isolated rodents evolved into a distinct, locally iconic subspecies.

The remnants of a creative early method of wildfire prevention.

This rugged area of red rocks and arches is often considered one of the most beautiful places on Earth.

One of the world’s largest collections of petroglyphs records 2,000 years of human activity.

This small memorial is dedicated to the Perryville State Prison firefighters who perished fighting the Dude Fire in 1990.

When it was built in 1929, this historic bridge was the only place to cross the Colorado River for 600 miles.

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

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

A partial tunnel blasted into a steep ridge is all that remains of a failed railway across Arizona.

This Native American settlement dates back to the Pueblo II period.

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

Dramatic river bend surrounds a natural red-rocked pedestal.

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

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

The final resting place of the businessman-turned-astronomer who helped discover Pluto stands near his observatory.

A replica of the flagpole that gave a frontier town its name.

Crafted in 1911, this steam locomotive spent its entire working life in Flagstaff.

An important piece of history from mankind's journey to the moon sits in the lobby of a government science lab.

The wreckage of a deadly bomber plane crash can still be found near an Arizona peak.

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