 With five towers each, County Mayo, County Kilkenny and County Kildare have the most.Mayo's round towers are at Aughagower, Balla, Killala, Meelick and Turlough, while Kildare's are located at Kildare Cathedral (which is high), and also at Castledermot, Oughter Ard, Taghadoe (near Maynooth) and Old Kilcullen.The only known round tower with a hexagonal base is at Kinneigh in County Cork, built in 1014.