St Mark 's reportedly suffering one of its worst floods in daily . A woman wades through high waters in Venice 's Piazza San Marco . Landmark Piazza San Marco under 5 feet 2 inches of water at one point . UNESCO has warned Venice at risk of high waters caused by climate change .
St Mark 's reportedly suffering one of its worst floods in daily . Landmark Piazza San Marco under 5 feet 2 inches of water at one point . UNESCO has warned Venice at risk of high waters caused by climate change .