The highest point in Washington state is a volcano covered in glaciers.

Atop an active stratovolcano, two lakes separated by a narrow strip of land.

Members of the Confederated Tribes of Warm Springs still net migrating salmon in the traditional way at this cataract on the Deschutes River.

Site of the greatest known waterfall that ever existed.

The only road through the heart of Glacier National Park.

Nuclear reactor created the plutonium used on Nagasaki.

Oregon's unexpected high desert, displaying layers of time in a colorful show.

An obscure waterfall that looks like something out of a fantasy novel.

An unusual waterfall in the Santa Rosa Range, within the Great Basin of Nevada.

The largest wildlife crossing in Utah allows local fauna to safely traverse the six-lane Interstate 80 at Parleys Canyon.

A towering tribute to decisiveness stands on the spot where Brigham Young and his followers decided that this must be the place.

The largest island on the great salt lake is home to curious creatures and strange stories.

An unusual geological feature towers over the remains of a dark episode in United States history.

An earthwork sculpture built by Robert Smithson in the Great Salt Lake only reemerges during drought.

A rapidly disappearing glacier filled with extinct grasshoppers, perfectly preserved in the ice.

The highest point in Montana is as rugged and singular as the state itself.

The easiest way to the highest point in Wyoming is only accessible via one hefty fee.

Where the famed daredevil attempted to launch himself across a canyon in a custom-built rocket.

Creek water that starts here has a 50/50 chance of ending up in the Atlantic or the Pacific.

This Yellowstone geyser may not shoot as high as the nearby Old Faithful, but it erupts for considerably longer.

An architect's childhood fantasy treehouse made real.

A miraculous natural phenomenon known as "the spring that breathes."

A creek tumbles over a series of step-like rocks to create this scenic water feature.

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