The tallest dam in Montana and top 10 in the country.

This once-booming Gold Rush town is now home to a herd of feral donkeys.

The world’s largest concentrated solar plant generates as many problems as megawatts.

Abandoned mine site with interesting artifacts to explore, including a 4-stamp mill.

This abandoned open-pit copper mine features stunning turquoise mineral pools and excellent rock-hunting opportunities.

A glimpse of mining history just beyond the tree line.

Rippling sand dunes frozen in the Arizona rock.

These once-beautiful historic graveyards are set against the barren Virginia City hills.

This often-overlooked canyon dazzles and intrigues with its many layers of colors, shapes and odd formations.

This landmark vessel dry-berthed in Tacoma's harbor served in emergencies and ceremonies for more than 50 years.

A large wind turbine installation in central Washington State is home to an extensive set of interpretive exhibits.

Standing 191 feet tall and measuring more than 55 feet in circumference, this is the world's tallest spruce tree.

Tacoma's historic Beaux-Arts train station is now a federal courthouse featuring large-scale glass sculptures by artist Dale Chihuly.

This tree has witnessed nearly 1,000 years of history.

This impressively large collection includes crackers shaped like Jimmy Carter, Mickey Mouse, and more.

This grove of ghostly cedars was killed in 1700 by an enormous tsunami, felt from the United States to Japan.

Twin Peaks' real life Double R Diner has been restored to its damn fine television look.

Only ruined buildings and abandoned charcoal kilns remain of this once bustling Wild West boom town.

Bizarre lunar-like landscape with thousands of large stone "hoodoos."

A mining camp built around an unexpected occurrence of silver.

An icy behemoth that towers over you with a blue ice cave in the winter and a roaring creek in the summer.

The beginning of the historic Iditarod Trail connecting the Alaskan cities of Seward and Nome.

A hulking remnant of Alaska's industrial gold mining boom in the 1920s.

This super-sized statue is the only public memorial to the deal that ended America's neutrality during World War II.