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Grianan of Aileach is an ancient stone fort on a site where a fort has stood for three millennia.
This view from the Walls of Grianan of Ailach takes in Inch Island, in Lough Swilly, Scalp Mountain, Lough Foyle, the City of Derry, the River Foyle as far as Strabane. It encompasses Counties Donegal, Derry and Tyrone.
You can see the three tiers of terracing within the walls and the entrances to two passages that run into the walls themselves. The scaffolding belongs to the "Board of Public Works" who were doing maintenance at the time of my visit.
There are three other panoramas of Grianan: