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SAN FRANCISCO, CA - MAY 24: Tourists ride bicycles on a newly constructed bike path near the Golden Gate Bridge on May 24, 2012 in San Francisco, California. The Golden Gate Bridge, Highway and Transportation District is preparing for the 75th anniversary of the iconic Golden Gate Bridge that will be marked with a festival on May 26 - 27 that will feature music, displays of bridge artifacts and art exhibits. The 1.7 mile steel suspension bridge, one of the modern Wonders of the World, opened to traffic on May 27, 1937. (Photo by Justin Sullivan/Getty Images)

SAN FRANCISCO, CA - MAY 24:  Tourists ride bicycles on a newly constructed bike path near the Golden Gate Bridge on May 24, 2012 in San Francisco, California. The Golden Gate Bridge, Highway and Transportation District is preparing for the 75th anniversary of the iconic Golden Gate Bridge that will be marked with a festival on May 26 - 27 that will feature music, displays of bridge artifacts and art exhibits. The 1.7 mile steel suspension bridge, one of the modern Wonders of the World, opened to traffic on May 27, 1937.  (Photo by Justin Sullivan/Getty Images)