The remains of a ruined mansion memorialize the 1906 earthquake.

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.

Big gun installations, built over a massive cemetery, now abandoned & hidden in trees.

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

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

San Francisco Bay's ghost town.

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

An abandoned, unfinished mansion on grounds strewn with lava rocks.

Once the gateway to the utopian dream-village of a Civil War embalmer.

Concrete strongholds stand guard over the Golden Gate.

A working model of the entire San Francisco Bay and much of the Sacramento River Delta, complete with regular tides that change every 14 minutes.

Frank Lloyd Wright died a year before construction on his largest public project even began.

Abandoned landscape once home to "the world's largest winery."

Once the largest winery in the world, this castle-like building now sits abandoned on the San Pablo/San Francisco Bay shore.

Where a staggering 747 ships were constructed during World War II.

'Cause the fence start shaking, the earth was quaking.

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

A New England-style lighthouse along California's beautiful Highway 1 gets a re-do.

Once close to extinction, there is no shortage of elephant seals on the beaches of Año Nuevo State Park.

A "gravitational anomaly" located in the redwood forests just outside of Santa Cruz, California.

This municipal playground was co-created by the father of one of the most playful characters ever.

Every year, over 25,000 monarchs overwinter in Pacific Grove.