Two craters, which probably erupted within the last 1,500 years and are now filled by alkaline lakes, represent Nevada's youngest known volcanic activity.

A glimpse of a waterfall is reached by a steel catwalk along a slot canyon located in an Ouray city park.

Drive up a paved road into "Nevada's Yosemite" for exquisite views and mountain hiking in an alpine setting.

An organ located deep within a cave, whose "pipes" are the geological features of the cave itself.

A lone tower rises above the cliffs in a city park, offering fantastic views of the Connecticut landscape.

The tallest bridge in California was constructed for a project that was eventually cancelled.

A building so large that it has its own weather.

This abandoned NASA launch site is now a memorial to a trio of astronauts who were killed there.

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

A museum in rural Utah documents the history of the Japanese Americans who were forcibly relocated there.

A short hike into the mountainside forest reveals a decaying 1890s town.

A spectacular overlook of the Little Grand Canyon of the San Rafael River, a deep sandstone gorge streaked with orange, red and white in a remote, uncrowded part of Utah.

Hiding amid the largest camellia collection in the country lies a charming children's maze, donated by a secret admirer.

A little-known occurrence of fossil wood in northern Washoe County, Nevada, near the Black Rock Desert.

In 1954, two enormous earthquakes occurred just minutes apart, resulting in prominent scarps that extend for miles along the range fronts.

An out-of-the-way state park in Oregon that features both a picturesque waterfall and the ruins of a hydropower plant.

A spectacular but little-known slot canyon in extreme northern Nevada, with sheer walls nearly 500 feet high and a perennial stream.

This settlement on the original Transcontinental Railroad began by harvesting timber, but transitioned to a forgotten 19th-century industry: harvesting ice.

A remote, little-known natural arch in granite in the desert of northwestern Nevada.

See Hoover Dam and the bypass bridge from a perspective usually off-limits to the public, and float the upper part of the Black Canyon National Water Trail.

With a crest near 10,000 feet, this treeless fault-block mountain in eastern Oregon provides stunning views and spectacular glacial landforms.

The Grand Canyon of Texas.

Thousands of years ago, Indigenous people painted images onto these canyon walls that are still on display today, provocative, mysterious, and enduring reminders of the people who lived here long ago.

This former open-pit manganese mine is now a massive graffiti canvas.