1. Acropolis of Athens (8.00-19.00)
2. Museum of Byzantine Culture – Thessaloniki (8.00-20.00, Monday 13.30-20.00)
3. Thessaloniki Archaeological Museum (8.00-20.00)
4. Philippi Archaeological site (8.00-20.00)
5. Drama Archaeological Museum (8.00-20.00)
6. Panagia Kosmosotira (The People Savior) Holy Monastery, Evros (open daily from 7:00 till 19:00 as it operates as church)
7. Grevena Archaeological collection (Monday closed, Tuesday-Friday:8.30-15.00, Saturday-Sunday: 8.30-18.00)
8. Museum of Asian Art, Corfu (8:30-20:00)
9. Arta Archaeological Collection (8:30-17:00, Monday closed)
10. Ioannina Byzantine Museum (8:30-17:00, Monday closed)
11. Ioannina Treasury (8:30-17:00, Monday closed)
12. Fortress of Ioannina (7.00-22.00)
13. Nekromanteion of Acheron (8.00-20.00)
14. Volos Athanasakeion Archaeological Museum (8.00-20.00)
15. N. Anchialos Archaeological site, Magnesia (7.30-19.30)
16. Fthiotida Byzantine Museum (8.00-18.00)
17. Osios Loukas Monastery (8.00-18.00)
18. Corinth Archaeological Museum (8.00-18.00)
19. Mycenae Archaeological Museum and site (8:00-18:00) Monday the Museum (13.30-20.00)
20. Epidavros Archaeological Museum and site (8.00-18.00) Monday the Museum (13.30-20.00)
21. Mystras Archaeological site (8.00-20.00). Sunday (8.00-15.00)
22. Aphaia Archaeological site and museum, Aigina (8:30-17:00)
23. Messinia Archaeological Museum (8.00-20.00)
24. Messene Archaeological site (8.30-20.30)
25. Herakleion Archaeological Museum (8.00-20.00)
26. Knossos Archaeological site (8.00-17.00)
27. Spinalonga (9:00-17:00)
28. Tiryns Archaeological site (8.00-20.00)
29. Nafplion Archaeological Museum (8.00-20.00) Monday the Museum (13.30-20.00)
30. National Archaeological Museum of Athens (9.30-16.00) Monday (13.30-20.00)
31. Numismatic Museum of Athens (8.00-20.00) Monday (13.00-20.00)
32. Ancient Agora of Athens, Museum of the Ancient Agora, North slope of Acropolis, Dionysos Theater, Roman Agora of Athens and Library of Andrianou (8.00-20.00 from 7/6)
33. Byzantine and Christian Museum of Athens (8.00-20.00 from 7/6) Monday closed
34. Rhodes Archaeological Museum (8.00-20.00) Monday closed
35. Palace of Grand Master of Knights, Rhodes (8.00-20.00) Monday (13.30-20.00)
36. Lindos Archaeological site (8.00-20.00) Monday (8.30-15.00)
37. Kos Archaeological Museum (8.00-20.00) Monday closed
38. Castle of Neratzia, Kos (8.00-19.00) Monday (13.30-19.00)
39. Asklepieion at Kos (8.00-20.00) Monday (8.30-15.00)
40. Ialysos Archaeological site (8.00-20.00) Monday (8.30-15.00)
41. Kamiros Archaeological site (8.00-20.00) Monday (8.30-15.00)
42. Philippi Archaeological site (8.00-20.00) the Museum is closed
43. Olympia Archaeological Museum and site (8.00-20.00) the Museum Monday (13.30-20.00)
44. Olympic Games Museum (8.00-20.00) Monday (13.30-20.00)
45. Olympia Excavation history Museum (8.00-20.00) Monday (13.30-20.00)
46. Temple of Apollo Epikourios (From sunrise till sunset)
47. Polycentric Museum of Aiges (8.00-20.00)
48. Agia Triada Archaeological site (10.00-16.30)
49. Nemea Archaeological site and Museum (8.00-17.00) Sunday and Bank holidays (8.00-15.00) Monday the Museum (12.00-17.00)
50. Psichro Cave (Diktaean Cave) (10.00-17.00)
51. The Palace of Nestor (8.30-18.00)
52. Pella Archaeological Museum (8.00-20.00)
53. Sounio Archaeological site (9.30-sunset)
54. Delphi Archaeological Museum (Sunday – Monday – Tuesday 8.30-15.00,
Wednesday – Saturday 8.00-20.00)
55. Delphi Archaeological site (8.00-20.00)
56. Ancient Messene Museum (8.30-20.30) Monday (14.00-20.30)
57. Vravrona Archaeological Museum from 10/6 (8.30-18.00) Monday (13.30-18.00)
58. National Archeological Museum from 14/9/2011-30/10/2011 (08.00-19.00 - Monday 13.30-20.00)

Note that in this present transitional period, the formation of the summer opening hours list of museums and sites will be continuously enriched, depending on seasonal hiring of security personnel.