This is the largest hillfort in Ireland and dates from the Neolithic period. A low embankment encloses an area of over thirty four acres and the site is thought to have fulfilled a ritual and ceremonial purpose rather than residential. Within the enclosure is some archaeological evidence of a small group of structures.
Going southwest along the R448 from Naas and joining the N78 southwest of Kilcullen (Irish: Cill Chuilinn). Dun Ailinne is in the south of County Kildare on the hill of Knockaulin to the west of Old Kilcullen and close to the N78.