A few dilapidated structures are all that remain of this deserted former silver mining town.

This tiny movie theater was the last one in the U.S. constructed in the Nuevo Deco architectural style.

A little-visited ghost town state park offers a glimpse into Montana’s "Silver Queen."

The highest point in Montana is as rugged and singular as the state itself.

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

An entire town preserved as a historic landmark.

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

This angular Dwarven tunnel cuts through a mountainside in Glacier National Park.

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

The original movie set for the home of 'Star Wars' hero Luke Skywalker.

The remains of a ruined mansion memorialize the 1906 earthquake.

Staircase winds down the side of Telegraph Hill through gardens, wild parrots flying overhead.

San Francisco's urban bison herd has persisted in the face of extinction, development, and disease.

Depicting scenes of everyday life - and specific individuals - in Great Depression era San Francisco.

A walk-in working camera obscura produces 360-degree live images of the San Francisco coast.

Junkbots and mud babies are the masterpieces in this fantastically sci-fi art museum.

The seawater playground of gilded-era San Francisco burned to the ground in 1966.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

A huge musical instrument played by the ocean.

An abandoned Cold War missile radar site.

The one-time watch house for incoming ships at the Golden Gate now stands abandoned and hidden in trees.

A winding path built in secret on the edge of the continent.

The haunting ruins of Jack London's dream house.

The lighthouse central to the 1980s horror classic "The Fog" is, in fact, located in one of the foggiest areas of the Pacific Coast.