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

On the edge of grassland in northeastern Colorado, these rock formations are some of the few remnants of a high plain that has eroded away over millions of years.

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

More than 21,000 images fill this overlooked gem of a prehistoric site.

The remains of a historic ranch house that witnessed the Civil War battle dubbed the “Gettysburg of the West.”

Despite time, colonization, and the brutal New Mexican heat, these Pueblo ruins still stand.

This giant pocket watch is the third iteration of a local landmark that has been standing just off the Santa Fe Plaza for over 100 years.

The oldest continuously occupied public building in the United States.

This innocuous New Mexico storefront was once the secret jump-off spot for Manhattan Project scientists.

A thin pane of glass keeps visitors from sliding off this futuristic skywalk.

Longest road tunnel in the world features an air treatment plant and the illusion of daylight.

The design of this beautifully crafted building was inspired by Norwegian glaciers.

This floating sculpture of ice is a poignant reminder of nature's power.

The only retired U.S. nuclear missile silo that is open to the public.

This tea house was a hand-built gift from Boulder's sister city in Tajikstan.

A downtown park built on top of unclaimed graves.

Strange red rock formations that have been attributed to a higher power for hundreds of years.

The highest bridge in America was built for an almost unnervingly small amount of money.

Unlike most arches, this geological oddity formed in a volcanic dike.

A mural of the Virgin of Guadalupe painted on the rock wall by canyon's religious namesake.

When ecosystems collide in the arid Southwest.

One woman's UFO-themed campground, complete with self-built energy vortexes, UFO-themed weddings, and magic bushes.

Thanks to a loophole in property ownership, this alleyway has become a cacophonous street gallery.

Every president in history is immortalized in bronze in downtown Rapid City.