TOP 15 attractions (1, 2, 4, 7, 9, 11, and 13 are MUST): 

1. Visit the Ancient Acropolis

2. Acropolis Museum

3. National Archaeology Museum

4. Wander the Pláka and Anafiotika Neighborhoods

5. Stroll Through the Ancient Agora: Ruins of the Marketplace

6. The Roman Agora & Hadrian's Library

7. Panathenaic Stadium & Olympic Stadium

8. Museum of Cycladic Art

9. Olympieion: Temple of Olympian Zeus

10. Byzantine Museum

11. Monastiraki & the Flea Market

12. Panaghia Kapnikaréa Church

13. See the Changing of the Guard at Syntagma Square

14. Church of the Holy Apostles

15. National Garden & Zappeion