Thoor Ballylee, 14th Century Hiberno-Norman tower described by Seamus Heaney as the most important building in Ireland. Its close association with the poetry and family of W.B.Yeats makes it an iconic landmark for the area and for the country. Climb the winding stair with guide Rena McAllen, and linger in the rooms that so inspired the poet W.B. while he lived here.