People walk on an interior mosaic floor of the St. Mark's Basilica in Venice, Italy, Tuesday, Dec. 17, 2019. Still invisible to the naked eye and the casual visitors, recent flood damage to St. Mark's Cathedral in Venice has been put at 5 million euros (dollars U.S. 5.5 million), the damage is caused by salt which expands as it dries. (AP Photo/Antonio Calanni)
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