US-50 in Nevada is known as "the Loneliest Road in America," but this earlier iteration of the route is even lonelier.

A tunnel with windows, so you don't miss out on the impressive views.

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

An incredible airplane graveyard sits outside this small museum dedicated to preserving aviation history.

Twice a year, visitors can tour the desolate site that birthed the Atomic Age.

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

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

Erosion and various mineral deposits give this striking canyon its distinct color and soft appearance.

These waterfalls can be twins or triplets, depending on how much it's rained recently.

The Grand Canyon of Texas.

Sunset-colored dunes of volcanic ash make taking a poor photo impossible.

A volcanic fissure over two miles long and up to 70 feet deep.

A French chateau, failed utopian community, odd museum, and Stonehenge replica in rural Washington State.

A petroglyph map of the upper Snake River carved by prehistoric hunter-gatherers.

The only road through the heart of Glacier National Park.

Other-worldly rock formations and ancient fossils abound in this unique stretch of Nebraska badlands.

A striking sculpture built to honor the women of the Lakota and Dakota Nations.

Largest outdoor staircase in the United States.

The first declared National Monument in the United States.

One man's quest to save his town with a trail of record-breaking sculptures.

This century-old roadside attraction is full of bizarre rock formations.

The remnants of an early American attempt at missile defense.

The biggest solar telescope in the world helps reveal the secrets of our sun.

A mistaken marker makes an erroneous claim along the historic Old Divide Road.