SAN FRANCISCO, CA - MAY 27:  A view of the Golden Gate Brdige from the Marin Headlands on May 27, 2012 in San Francisco, California.  The Golden Gate Bridge celebrates its 75th anniversary today. The 1.7 mile steel suspension bridge, one of the modern Wonders of the World, opened to traffic on May 27, 1937.  (Photo by Ezra Shaw/Getty Images)