Some hillforts have cairns inside their boundaries and there are many speculations about this phenomenon, the theories range from being a strange cult religion to just coincidence the same kind of area as they both like (hill tops with commanding views of the local vicinity), the excavation at Freestone Hill in County Kilkenny has shown that there was indeed a ditch cut out around the cairn, evidence that they had respect for the feature no matter what they decided to believe about it.