High angle view of Temple of Olympian Zeus, Hadrian's Arch and Athens city centre, Athens, Greece, Europe

color image horizontal travel destinations travel outdoors day athens greece capital cities greece europe building architecture clear sky sky hadrian's library library old ruin past history ancient roman column support classical cityscape city urban scene tree hill temple of olympian zeus athens unesco unesco world heritage site grass hadrian's arch no people nobody no one no person historic ruin ruins historical old ruins daytime columns pillar pillars cityscapes cities urban urban scenes travel destination tourist destination tourist destinations