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Tourists visit the old town of Chania, Greece, May 16, 2018. Chania is a port city on northwestern Crete island of Greece. (Xinhua/Lefteris Partsalis)

Tourists visit the old town of Chania, Greece, May 16, 2018. Chania is a port city on northwestern Crete island of Greece. (Xinhua/Lefteris Partsalis)