Parthenon, Acropolis and clouds in blue sky, UNESCO World Heritage Site, Athens, Greece, Europe

parthenon acropolis athens greece unesco ancient greece temple athena architecture historical site columns blue sky fluffy clouds cultural landmark tourist attraction classical architecture european history ancient ruins landscape skyline sightseeing heritage monument civilization greek mythology archaeological site travel destination scenic view cultural heritage iconic structure historical significance ancient civilization urban landscape panoramic view hilltop marble ruins ancient architecture tourism exploration historic landmark breathtaking view ancient history cultural significance sky clouds scenic landscape natural beauty unesco listing world heritage