Tourists walks in St. Mark square on November 16, 2019 in Venice, three days after the city suffered the highest tide in 50 years. - Flood-hit Venice was bracing for another exceptional high tide on November 15, as Italy declared a state of emergency for the UNESCO city where perilous deluges have caused millions of euros worth of damage. (Photo by Filippo MONTEFORTE / AFP) (Photo by FILIPPO MONTEFORTE/AFP via Getty Images)