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Aerial photo taken on June 14, 2020 shows the town and beach of Perissa which is famous for its black volcanic sand in Santorini, Greece. Due to the COVID-19 crisis, Greece's attractions reopened their gates to tourists on Monday, with protecting the health of visitors and locals being its top priority, as Prime Minister Kyriakos Mitsotakis has announced. (Photo by Lefteris Partsalis/Xinhua)