Each of the bridge's two main cables is made of 27,572 strands of wire. Often referred to as "the bridge that couldn't be built," the Golden Gate Bridge crosses the stretch of water nicknamed "the Golden Gate" by gold prospectors heading to the Californian hills. Prior to 1937, San Francisco was America's largest city but its growth rate was slow compared to others, due to the lack of a link with other communities around the bay. The size of the strait (2,042 meters wide) combined with strong winds and regular earthquakes led many construction experts to say a bridge couldn't be built. The solution? Huge amounts of concrete, 128,747 kilometres of wire housed inside two cables, 600,000 rivets and a whole lot of hard work.
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