This small town was built around a marble quarry and named after one of the most famous sources of marble in the world.

Local lore holds that Butch Cassidy took an escape route through Red Canyon's sandstone hoodoos after an attempted murder.

A ghost town that held steady longer than most, but finally gave up the ghost.

An improbable waterfall springs from an orange-white cliff face, tumbling into the headwaters of the Virgin River above Zion National Park.

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

The lost ruins of the forgotten ferry lie hidden beneath the silt.

In one of the hottest parts of the Mojave Desert, shallow bedrock forces the typically dry Mojave River to the surface in this canyon, providing a vital oasis for humans and wildlife.

This large artificial waterfall in Washington state was merely an incidental byproduct of a technological megaproject.

A unique museum where guests can rent and operate a locomotive.

It's safe—and permitted—to walk across these twin natural sandstone arches.

Now a city park, this site started as a stage stop, then was a working ranch, and finally became a dude ranch that specialized in letting wannabe divorcees establish Nevada residency.

On October 26, 1963, a 12-kiloton nuclear device was detonated here in granite some 1,211 feet below the ground surface.

An old railroad grade built for the construction of Hoover Dam is now a recreational trail featuring several tunnels and sweeping views of Lake Mead.

As fallout from an irrigation project, a formerly cottonwood-lined stream is now a sandy, desolate, post-apocalyptic channel lined with weathered stumps and tumbleweeds.

An ill-fated attempt to grow wheat in the sagebrush steppe of northeastern Nevada.

Located in the remote Monitor Valley, this travertine bowl contains a scalding pool of water.

The longest and widest floating bridge in the world.

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

This huge dam across the Colorado River caused an armed standoff between two U.S. states.

A former gold rush boomtown has managed to stay in business for over 100 ramshackle years.

A young botanist's horticultural vision realized through a lifetime of planting, tending, and collecting seeds.

One of the Seven Wonders of the Modern World holds the world's tallest metal staircase.

A beautiful geyser under environmental threat.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.