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Photo taken on May 9, 2021 shows the Establishment of the Poseidoniasts at night on the island of Delos, Greece. Delos, once a booming trading center in the middle of the Aegean Sea near Mykonos, is a UNESCO world heritage with a history of 5,000 years. It is one of the most important mythological, historical and archaeological sites in Greece. (Xinhua/Marios Lolos)
