This sign designates the road that leads to the infamous Area 51.

One of the best-preserved early 20th-century ore-processing mills in Nevada is maintained in a state of arrested decay.

A volcanic cone that formed over 600 years ago.

The limestone composition of this spectacular arch makes it unique to the region.

Take a dip in the world's largest mineral hot springs pool.

One of the few remaining indigenous petroglyph sites in Nevada.

Mysterious meeting place for UFO hunters near Area 51.

The eerie ruins of an isolated abandoned town nicknamed "the Widowmaker" for its deadly gold mine.

These falls, sometimes called the "Niagara of the West," still put on a good show at the right time of year.

Equipment used to mine silver and lead has been preserved in this almost-ghost town in northern Nye County.

Ruins of the original wooden flume that carried water to Virginia City are still visible high on the Virginia Range.

The precious-metals strikes dating back to the 1860s are now mostly inactive, but this area has become the United States' only domestic source of lithium.

An abandoned mine serves as a stark memorial of when mercury was a valued strategic metal.

Deep vertical fissures like miniature slot canyons cut across the cemented volcanic rock of Black Point above Mono Lake.

Colorful outcrops and cliffs just north of Reno provide a scenic backdrop for hiking and mountain biking.

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

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.

For decades, the largest tungsten producer in the U.S. was located in a spectacular setting in the high Sierra Nevada, with some of the workings over 11,000 feet.

A deep toxic lake fills this abandoned open-pit copper mine, now a Superfund site.

The only United States mine for magnesium carbonate has been operating continuously since the 1930s.

The ruins of a military outpost from the 1860s form the centerpiece of a Nevada state park.

This Gold Rush ghost town was once the subject of a territorial dispute between California and Nevada.

The viewpoint for this attractive, off-the-beaten-path waterfall is reached by a paved, wheelchair-accessible trail.

The flow from this waterfall sometimes comes out of springs below its rim.