Remains of the Hadrian's Library and the old mosque in Monastiraki square, Athens, Greece, Europe

color image horizontal travel destinations travel outdoors day athens greece capital cities greece europe building architecture cloud hadrian's library library old ruin past history ancient roman column support classical tree grass monastiraki town square tzistarakis mosque mosque islam muslim place of worship religion monastiraki square art museum arts culture and entertainment museum of greek folk art no people town squares public square nobody no one no person historic ruin ruins historical old ruins daytime columns pillar pillars travel destination tourist destination tourist destinations