Since Greece is the cradle of Western Civilization, its early history is one of the most important legacies and must be high on the list of the most important locations in the world. UNESCO has recognized this and has listed a significant number of these places on its World Heritage List. My favorites are listed below along with photos.
1. Archaeological Site of Delphi (1987)
2. Acropolis, Athens (1987)
3. Meteora (1988)
4. Paleochristian and Byzantine Monuments of Thessaloniki (1988)
5. Archaeological Site of Epidaurus (1988)
6. Medeival City of Rhodes (1988)
7. Archaeological Site of Olympia (1989)
8. Delos (1990)
9. Archaeological Site of Mycenae (1999)
10. Historic Centre (Chora) with the Monastery of St John the Theologian and its cave on the island of Patmos (1999)
11. Old Town of Corfu (2007)