The round tower stands at over nine metres tall, and damage to the top of the tower is thought to have happened at a battle here during the 1798 rebellion. The circumference at the base is 14.5 metres and at almost 2 metres from the ground is the doorway.

According to the Annals of the Four Masters Kilcullen was plundered by the Danish in 936 and 944 AD. The graveyard is still in use today.