Golden Gate Bridge, which recently celebrated 75 years, is a suspension bridge spanning the Golden Gate, the opening of the San Francisco Bay into the Pacific Ocean.

As part of both US Route 101 and California State Route 1, the structure links the city of San Francisco, on the northern tip of the San Francisco Peninsula, to Marin County.

It is one of the most internationally recognised symbols of San Francisco, California, and the United States.

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One of the stanchions erected in the building of the Golden Gate bridge, connecting Marin and San Francisco, casts a shadow over houses at its foot, 1935.

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The twin towers of the bridge spanning the Golden Gate strait in California, which will support a roadway between San Francisco and Marin County, 1936.

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The 'Santa Clara', a ferry belonging to the Southern Pacific line, sails under the first structures of the Golden Gate Bridge, San Francisco, 1936.

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The Golden Gate Bridge in San Francisco during its construction, January 1, 1937.

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Construction workers attach steel beams to the Golden Gate Bridge in San Francisco during its construction, January 1, 1937.

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Chief Engineer of National Parks Frank Kettredge with his chief counsel George H Harlan on the Golden Gate suspension bridge in San Francisco, March 1, 1937.

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The base of the south pier, one of the pillars supporting the Golden Gate Bridge in San Francisco, March 1937.

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The Golden Gate Bridge in San Francisco, California, completed in 1937.

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A warship approaches the Golden Gate Bridge in San Francisco, December 31, 1942.

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An air-to-air front view of a C-5A Galaxy aircraft, in a camouflage paint scheme, as it flys over the San Francisco Bay, July 27, 1983. The Golden Gate Bridge can be seen in the background.

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The north tower of the Golden Gate Bridge is visible as fog rolls in on October 3, 2001, as seen from Marin, California.

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A view of the Golden Gate Bridge in San Francisco, California, November 1, 2001.

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A view of the Golden Gate Bridge in San Francisco, California.

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Hundreds of volunteers hold a five mile long silk banner at Baker Beach near the Golden Gate Bridge on September 8, 2002, in San Francisco, California.

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Waves crash against the shore at Fort Point, near the Golden Gate Bridge, during a fierce storm on November 8, 2002, in San Francisco, California.

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A US Navy Blue Angels F-18A Hornet flies past the south tower of the Golden Gate Bridge during a practice performance for Fleet Week on October 11, 2002, in San Francisco, California.

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Surfers ride a wave at the Golden Gate Bridge in Fort Point, San Francisco on November 17, 2002. Surfers congregate daily to surf at Fort Point and battle the harsh and dangerous conditions.

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Swiss Team Alinghi headed by Ernesto Bertarelli and Oracle BMW Racing team headed by Larry Ellison race during the Moet Cup in the San Francisco Bay on September 16, 2003, in San Francisco, California.

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In this US Navy handout photo, the USS Mobile Bay arrives in San Francisco for the Parade of Ships during San Francisco Fleet Week on October 11, 2003.

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A ship passes under the Golden Gate Bridge on January 27, 2005, in San Francisco.

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A man looks over the railing of the Golden Gate Bridge January 27, 2005, in San Francisco.

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A sign marking the spot of a crisis counselling phone is seen on the Golden Gate Bridge on January 27, 2005, in San Francisco.

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A woman looks over the railing of the Golden Gate Bridge on January 27, 2005, in San Francisco.

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A boy plays in the water at Baker Beach near the Golden Gate Bridge on March 25, 2005, in San Francisco, California.

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Two runners watch as waves crash against the rocks at Fort Point near the Golden Gate Bridge on December 28, 2005, in San Francisco.

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With the Golden Gate Bridge in the background, dogs play in the water on the beach at Crissy Field on February 24, 2006, in San Francisco.

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Fireworks light up the Golden Gate Bridge and San Francisco Bay as Americans celebrate Independence Day on July 4, 2006, in San Francisco, California.

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A view of the Golden Gate Bridge on June 20, 2007, as seen from Sausalito, California.

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Cars drive over the span of the Golden Gate Bridge on August 23, 2007, in San Francisco, California.