Tourists sit at a cafe terrace on the fl [Getty Images]

Tourists sit at a cafe terrace on the flooded Piazza San Marco (St Mark's square) on October 22, 2009 in Venice. The "acqua alta" (high water), a convergence of high tides and a strong sirocco, stood at 105 centimeters. AFP PHOTO / ANDREA PATTARO (Photo credit should read ANDREA PATTARO/AFP via Getty Images)

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