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Grianan of Aileach is an ancient stone fort. It stands a top a hill - a site on which a fort has stood for three millennia.
This view from the heather outside Grianan of Aileach takes in Inch Island, in Lough Swilly, Scalp Mountain, Lough Foyle, a glimpse of the City of Derry. Then as we continue we get a glimpse of the River Foyle as far up river as Strabane.
What is more remarkable is that forts of near identical design stand in West Donegal and on the Aran Islands. Suggesting that this was not just the result of the efforts of an early group of skilled dry-stone-wallers, but the product of a sophisticated culture with architects, communication and planning.
There are three other panoramas of Grianan: