A Golden Gate Bridge Patrol officer rides a bicycle on the bridge in San Francisco, Tuesday, June 7, 2011. As millions flock to summer vacations at national landmarks _ particularly those that are ... more 
A Golden Gate Bridge Patrol officer rides a bicycle on the bridge in San Francisco, Tuesday, June 7, 2011. As millions flock to summer vacations at national landmarks _ particularly those that are embedded in our culture as symbols of freedom and the American spirit _ the level of post-Sept. 11 security often depends on the symbolism. (AP Photo/Jeff Chiu) less 
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Associated Press | Photo By Jeff Chiu
Thu, Jun 9, 2011 11:25 PM EDT