You can see detailed maps of Greece for larger cities and towns with streets and surroundings:
Athens
Asprovalta
Chalcidice
Ierissos
Kassandreia
Kavala
Cephalonia
Corfu
Crete
Lefkada
Leptokarya
Mykonos
Nafplio
Neos Marmaras
Paralia
Rodos
Santorini
Thessaloniki
Thasos
Ouranoupoli
Zakynthos