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Visit Grianan of Aileach, Ireland

The Grianan of Aileach (Greenan Ely or Greenan Fort) is a hillfort atop the 244 metres (801 ft) high Greenan Mountain at Inishowen in County Donegal, Ireland. The main structure is a stone ringfort, thought to have been built by the Northern Uí Néill, in the sixth or seventh century CE; although there is evidence that the site had been in use before the fort was...