Photo: Stanislav Amelchyts, CC BY-SA 3.0 Free historic sites in Athens
Photo: Stanislav Amelchyts, CC BY-SA 3.0 
Photo: Antonio Fajardo i López, CC BY-SA 3.0 Anafiotika
Free, always
Photo: Giles Laurent, CC BY-SA 4.0 Acropolis
Free at certain times
Photo: Chabe01, CC BY-SA 4.0 Ancient Agora
Free at certain times
Photo: O.Mustafin, CC0 Areopagus Hill
Free, always
Photo: Joanbanjo, CC BY-SA 3.0 Plaka
Free, always
Photo: A.Savin, CC BY-SA 3.0 Hadrian’s Arch
Free, always
Photo: Mister No, CC BY 3.0 Panathenaic Stadium
Free outside, paid inside
Photo: C messier, CC BY-SA 4.0 Syntagma Square
Free, always
Photo: Dimorsitanos, CC BY-SA 3.0 Ermou Street
Free, always
Photo: Jean-Pierre Dalbéra from Paris, France, CC BY 2.0 Temple of Olympian Zeus
Free outside, paid insideRoman Agora
Free outside, paid insideTechnopolis
Free, always
Photo: Apaleutos25, CC BY-SA 4.0 First Cemetery of Athens
Free, alwaysAthens Trilogy
Free outside, paid inside
Photo: Robert Anders from Hamburg, Germany, CC BY 2.0 Odeon of Herodes Atticus
Free outside, paid insideChurch of Kapnikarea
Free, alwaysLittle Metropolis
Free, alwaysSotira Lykodimou
Free, always
Photo: Giorgoos, Public domain Kolonaki
Free, always
Photo: Unknown author, Public domain Koukaki
Free, always
Photo: Jean Housen, CC BY 3.0