https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/4023863
Golden Gate Bridge.
Once called "the bridge that couldn't be built," today it is one the seven wonders of the modern world. This magnificent span, perhaps San Francisco's most famous landmark, opened in 1937 after a four-year struggle against relentless winds, fog, rock and treacherous tides. Original public domain image from Flickr
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