Operational for less than a year, this mill produced more than 11,000 tons of chrome concentrate in its short lifespan.

The last physical evidence of the Lewis and Clark trail is one of their autographs etched into this giant rock.

A rapidly disappearing glacier filled with extinct grasshoppers, perfectly preserved in the ice.

Mining town from the late 1890s, once home to Calamity Jane.

This off-the-beaten-path abandoned town is a relic of Montana's silver mining boom.

This amazingly preserved Gold Rush town is a historian's dream.

New fungal and bacterial species call this deadly lake home.

An old World War II hangar holds 20 vintage aircraft and the rare opportunity to take a ride in a 1940s warbird.

At the base of Steens Mountain resides an otherworldly desert.

The largest wooden building in the world now houses a fascinating collection of aircraft.

The wooden airship was the largest flying boat ever built.

Where Nor'easters go to die.

Unknown to many, this sparkling turquoise lake hides amid Oregon's snowcapped mountains.

Bridges, terraces, and replicas of historic structures all built of rock and petrified wood by one man.

This lake in the Cascades lives up to its name, disappearing down a hole every spring.

No one knows how this Pacific Northwest spruce tree came to have so many trunks.

A roaring, awe-inspiring double cascade of icy water flows through woodland Oregon like something out of a Tolkien novel.

On the Oregon coast there is a natural hole that seems to be draining the sea.

This lonely gas station has stood at this location since 1917.

A dazzling display of red rocks weathered into spires and hoodoos.

A tunnel with windows, so you don't miss out on the impressive views.

The fifth-longest natural arch in the world, and the longest outside China.

This quiet park's strange sedimentary spires were named after Kodak's color film.

The largest island on the great salt lake is home to curious creatures and strange stories.