One of the world's oldest and most massive living organisms is a grove of quaking aspens.

A relic of the region's once booming timber industry.

This larger-than-life portrait in Nevada's silver boomtown is decorated with over 3,000 silver dollars.

Where a railroad loops under or over itself to rise or drop more than 70 feet in a short distance.

Anyone can play paleontologist at this quarry that has Cambrian fossils galore.

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.

The gateway to the goldfields of British Columbia, at the head of navigation on the Fraser River, features Gold Rush era buildings, artifacts, and living history exhibits

A photogenic rock-art site that is also a popular climbing and canyoneering area.

The only perennial creek in the Mojave Preserve is also the site of an 1860s fort.

Collapsed charcoal kilns in the Spring Mountains of southern Nevada.

A pair of large white marble lions guard this stretch of the Mojave Desert, and it is utterly mysterious how they got there.

A museum dedicated to the life and career of the gifted but controversial general.

Traces of General Patton’s Mojave Desert training camps for the North Africa campaign.

This enormous fiberglass cow near Death Valley National Park once graced a casino roof in Las Vegas.

An improbable set of attractive limestone caverns forms the centerpiece of Providence Mountains State Recreation Area, in the heart of the Mojave Desert.

A remote field of nearly pristine sand dunes in the heart of the Mojave Desert.

One of two trees tied for the distinction of the largest western juniper in Oregon.

The first radio telescope dedicated to the Search for Extraterrestrial Intelligence.

Two geoglyphs that are truly unique to North America.

Formerly frequented by Hollywood stars and now open for tours.

This secluded date farm can be reached only by following a bumpy, single-lane desert road.

Built as a schoolhouse in 1914, this Mission-style building has also served as a dancehall, a library, an Army canteen, and now a cultural museum.

Boats and fish both find their way through this massive hydroelectric structure.

An ordinary rancher stumbled upon one of the world’s largest collections of Pliocene horse fossils.