A Facebook Inc. employee works on a laptop computer at the company's new campus in Menlo Park, California, U.S., on Friday, Dec. 2, 2011. Facebook hopes to accommodate over 6,000 employees on the new campus, which will spread out over a million square feet of office space when completed in mid-December 2011. Photographer: David Paul Morris/Bloomberg
Golden Gate Bridge in San Francisco. Getty Images
Google headquarters, also known as Googleplex, is seen in Mountain View, California. Donald Weber / VII / Corbis
The Big Sur Highway 1 in San Francisco, California. Rosemary Behan / The National
The popular and easy way to get around San Francisco is the tram. Rosemary Behan / The National
At Yosemite Park everything is so clean and so dramatic it looks like a film set. Rosemary Behan / The National
A street scene in San Francisco. Rosemary Behan / The National
The Coit Tower in San Francisco with the former prison Alcatraz in the background. Rosemary Behan / The National
Fresh oysters on the coast of San Francisco, California. Rosemary Behan / The National
The Sonoma countryside in California. Rosemary Behan / The National
The view from the Camera Obscura at Point Lobos, San Francisco, California. Rosemary Behan / The National
The Painted Ladies from Alamo Sqaure in San Francisco, California. Courtesy of Jose OL Berengueres
In pictures: Northern California from Silicon Valley to Yosemite