Grianan of Aileach

It is a stone fort with an amphitheater, near the top of Mount Grianán, which is roughly 18 km south of Buncrana. The sand may resemble something similar to a Roman circus. It is possible that the fortress has been here for at least 2000 years, but it is believed that the site itself dates back to pre-Celtic times, when it was a temple of the god Dagda. Among the 5th and 6th centuries was the seat of the O'Neills before they demolished Murtogh O'Brien, King of Munster. Much of the present structure is a reconstruction thanks to work carried out over 4 years by a specialist team between 1874 and