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A worker unloads crude salt at saltworks in Ston, Croatia, on Aug. 22, 2018. The Ston salt pans are thought to be among the oldest in the Mediterranean. (Xinhua/Grgo Jelavic)

A worker unloads crude salt at saltworks in Ston, Croatia, on Aug. 22, 2018. The Ston salt pans are thought to be among the oldest in the Mediterranean. (Xinhua/Grgo Jelavic)