Sat on a hilltop 650m above sea level, The Seat of Fionn or ‘Suidh Fhionn’ dates from between 3300 and 3000BC. You might ask why build it at such a height, when it would have been a massive task in the Neolithic period? But when you get to the summit, it soon becomes obvious. The rolling hills, patchwork of fields and shimmering lakes of South County Dublin and Wicklow open up before you.