Greece started opening its doors to visitors from China, United States and Britain. All visitors must provide a vaccination certificate or a negative PCR test and fill in a passenger locator form about their plans in Greece. This directive expires on June 14 but can be extended.Acropolis : The Acropolis is a rocky mound rising in the heart of modern Athens, crowned by three magnificent temples dating from 5th century BC.Santorini : Santorini is best known for the west coast cliff-top towns of Fira and Oia, which appear to hang over a deep, blue sea-filled caldera. Made up of typical Cycladic whitewashed cubic buildings, most of them have been converted into boutique hotels with infinity pools to accommodate more luxurious tourists.Mykonos : Mykonos is noted for its chic boutique hotels, classy seafood restaurants and live music venues. Other attractions include Paraportiani and numerous sandy beaches along the island's south coast.36 TTW World