Hungary, Budapest, View across the River Danube towards Margaret Island from Castle Hill.

Israel, Bethlehem, Church of the Nativity.

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 Clare, Doonagore Castle which is a 16th century tower house above Doolin village.

Ireland, County Offaly, Birr Castle current home of the 7th Earl of Rosse.

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.

Northern Ireland, County Derry, The Guild Hall, a section of its Neo Gothic facade and the clock Tower.

Northern Ireland, County Derry, The Guild Hall, view from the city's 17th century walls with a cannon in the foreground.