Republic of Ireland, County Kildare, Kildare town, St Brigids Cathedral and Round Tower.

Ireland, County Kerry, Rattoo Round Tower situated in old monastic settlement.

Ireland, County Tipperary, Rear view of the Rock of Cashel, a spectacular group of Medieval buildings set on an outcrop of limestone in the Golden Vale.

Ireland, County Down, Saul, Commemorative church built in 1933 on the site of St Patrick's first church in Ireland.

Ireland, County Down, Saul, Commemorative church built in 1933 on the site of St Patrick's first church in Ireland.

Ireland, County Down, Saul, Commemorative church built in 1933 on the site of St Patrick's first church in Ireland.

Ireland, County Sligo, Drumcliffe High Cross with stump of Round Tower in the background.

Ireland, County Sligo, Drumcliffe, Stump of Round Tower with Ben Bulben mountain in the background.

Ireland, County Offaly, Clonmacnoise Monastic Settlement, Replica of the South Cross with Round Tower in the background.

Ireland, County Wicklow, Glendalough Monastic site, The Round Tower emerging from amidst autumn foliage.

Ireland, County Wicklow, Glendalough Monastic site, The Round Tower.

Scotland, Glasgow, Peoples Palace conservatory hothouse. Part view of glass roof and brick tower with circular windows.