Horologion of Andronikos Kyrrhestes (Tower of the Winds) in Roman Agora, Athens, Greece

horologion andronikos kyrrhestes roman agora athens ancient architecture historical site timekeeping stone structure reliefs urban landscape tourism greece cultural heritage antiquity ruins monument classical sightseeing landmarks excavation preservation archaeology exploration visitor attraction landmark greek history artistry craftsmanship tourist destination civilization details engineering nature day clouds sky significance tour relic architectural