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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.
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.
What is more remarkable is that forts of near identical design stand in West Donegal and on the Aran Islands. This suggestis 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: