Defensive stone walls of Dun Aengus, prehistoric hill fort, Inishmore, largest Aran Island, Galway Bay, County Galway, Connacht, Republic of Ireland

dun aengus defensive walls dry stone prehistoric fort inishmore aranj islands galway bay ancient architecture historical site circles fortification irish heritage earthen mounds landscape green fields archaeological northwest europe coastal view rugged terrain tourism history preservation culture exploration scenic beauty structures archaeology natural ruins fortress coastline cultural landmark stonework civilization