Clondalkin Round Tower is located in the historic village of Clondalkin in county Dublin. This beautiful 9th century round tower is built on the site of a monastery founded by St Mochua 200 years earlier. It is one of only four remaining in County Dublin, the others are located in Swords, Lusk and Rathmichael. It stands over 90 feet high and is thought to be one of the earliest examples as the granite on the lintels is flat. The most unusual feature of this tower is the very pronounced buttress at the base which is constructed with a different type of stone to the tower. The series of steps was believed to be added to the buttress in the late 19th century. The tower has 6 windows but the top 4 point towards the cardinal points of north, south, east, and west. Nearby is the church of St John with two early crosses and a granite font as well as St Brigid’s well. The Viking King, Olaf the White, built a fort here in 852AD. The monastery was plundered in 832 a.d and in 866 a.d.