In pics: archaeological site of island Delos in Greece

Part of the archaeological site of the island Delos is seen in Delos, Greece, on May 10, 2021. 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)