The document discusses 18 Greek sites that are included on UNESCO's World Heritage List, including the Acropolis in Athens, the archaeological sites of Delphi, Olympia, and Mycenae/Tiryns, and several important monasteries. Many of the sites are significant for their architecture, art, and role in the development of classical Greek culture. They showcase Greece's important contributions to philosophy, democracy, theater, and other areas through surviving monuments from antiquity.