Golden Gate Bridge's 75th anniversary Golden Gate Bridge from Pacific Overlook, photo by Mason Cummings. Golden Gate Bridge from Pacif...

Golden Gate Bridge's 75th anniversary

Golden Gate Bridge from Pacific Overlook, photo by Mason Cummings.

Golden Gate Bridge from Pacific Overlook, photo by Mason Cummings. The Marin tower of the Golden Gate Bridge upon completion in 1935. From the holdings of the Golden Gate Bridge, Highway and Transportation District, Used with Permission, www.goldengate.org

Golden Gate Bridge from Pacific Overlook, photo by Mason Cummings. The Marin tower of the Golden Gate Bridge upon completion in 1935. From the holdings of the Golden Gate Bridge, Highway and Transportation District, Used with Permission, www.goldengate.org The Marin tower of the Golden Gate Bridge under construction in 1933. From the holdings of the Golden Gate Bridge, Highway and Transportation District, Used with Permission, www.goldengate.org Workers on the main cable of the Golden Gate Bridge. From the holdings of the Golden Gate Bridge, Highway and Transportation District, Used with Permission, www.goldengate.org Golden Gate Bridge tower from below. Photo by Della Huff. Media and cars at the Bridge on opening day. From the holdings of the Golden Gate Bridge, Highway and Transportation District, Used with Permission, www.goldengate.org

The Golden Gate Bridge at San Francisco, the longest suspension bridge in the world was opened on May 27, 1937. A view taken from one of the towers of pedestrians swarming across the Golden Gate Bridge immediately after the opening. (AP Photo)

Golden Gate Bridge sunset from Fort Baker, photo by Mason Cummings.

San Francisco has held a yearlong 75th anniversary celebration of the opening of the iconic Golden Gate Bridge with a string of parties, guided tours and festivals. The bridge opened to the public on May 27, 1937.