panoramic view to the old national observatory of athens city, greece on top of the nymphs` hill in thission, athens

acropolis architecture athens attica attractions basin building city cityscape culture day destination district dome europe famous filopappou greece greek heritage hill historic historical history holidays icon landmark landscape mediterranean national nature neoclassical nymphs observatory old outdoors panoramic picturesque plaka scenery seen sightseeing summer sunny thiseio thisseion thissio thission top tourism touristic traditional travel urban vacation view visit