Wheels of chrome by the thousands adorn this California Historical Landmark.

California's own majestic geyser is powered by a subterranean volcano.

One of the largest free-standing structures ever built, this dirigible hangar is now simply a giant skeleton.

An enchanting tunnel of cypress trees leads to an old morse code station still used today.

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

This abandoned boat was left in place thanks to its rotting beauty.

Over 315,000 preserved amphibians and reptiles in jars.

A century and a half of research in the sciences and natural history, still going strong.

San Francisco's newly reopened hands-on science museum.

Not merely a museum – but a whirring powerhouse that offers a subterranean peek into the heart and soul of cable car operations.

Tiki luxury on Nob Hill.

An vast warehouse of everyday treasures in Berkeley, CA.

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

This rare example of a "tidefall" is a spectacular drop from the cliffs down onto the beach.

Abortion, prohibition, religion, war, and fear all play a part in the history of this idiosyncratic Pacifica castle.

A burnt orange monolithic dome structure perched on a hillside near Interstate 280.

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.

Across Ring Mountain is a vast collection of Native American petroglyphs unique to the region.

One man's love of natural beauty led to the creation of this hidden granite monument.

George Lucas donated this park to honor the birthplace of his two biggest movie franchises.

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

Centuries of biking history are nestled in the shadow of the birthplace of contemporary mountain biking.