The Stone Fort of Grianán of Aileach sits on a hilltop in Inishowen County Donegal. 250m above sea level, the stone fort was probably first built on an earthen rath.

The view from Aileach is breathtaking. The glistening waters of Lough Foyle and Lough Swilly are clear, as is the form of the entire peninsula. A windy and exposed place, Grianán has been a silent witness to the history of Ireland.

The origins of the Grianán of Aileach fort are dated back to 1700 BC. It is linked to the Tuatha de Danann who invaded Ireland before the Celts and built stone forts on top of strategic hills. They worshipped Dagda (the Good God) and he too is associated with the origins of Aileach. It was he who ordered the building of a stone fort to act as a burial monument to his dead son.