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The Millennium Bridge
In ushering in the new millennium, the city of London, England, came up with a not so brilliant idea to commemorate the once-in-a-lifetime event. In mid-2000, the millennium bridge was unveiled and attracted massive crowds of human traffic that the bridge had to be closed down after barely three hours of use. The engineers failed to account for increased foot traffic, and the bridge swayed from side to side every time there was an influx of people. The city had to cough an additional $6.6 million to the initial $24.1 million to fix the error.