Photo: Notafly, CC BY-SA 3.0 via Wikimedia Commons
The mound is an Iron Age fort, circa 500 BC. Given its location, the Normans probably palisaded and garrisoned it by knee-jerk reflex, but they never built a stone castle. But excavations around it in the 1970s revealed dwellings from 7000 BC, the Mesolithic or Middle Stone Age. These were ten tepees, with saplings bent into a framework then covered in hides, and with a central hearth. Although there's evidence of earlier human activity in Ireland, this is the earliest fixed "village"; it had been thought that Mesolithic people here were nomadic hunter-gatherers and that settled dwellings and agriculture only came later in the Neolithic or New Stone Age.
The Mount Sandel Mesolithic site is in Coleraine, County Londonderry, Northern Ireland, near the River Bann and just to the east of the Iron Age Mount Sandel Fort. It is one of the oldest archaeological sites in Ireland with carbon dating indicating an age of 9,000 years old (7,000BC). Gwendoline Cave in County Clare is the only site in Ireland with evidence of human occupation that pre-dates this location. Mount Sandel Mesolithic site is a Scheduled Historic Monument in the townland of Mount Sandel, in Causeway Coast and Glens Council area, at Grid Ref: C8533 3076. It was excavated by Peter Woodman in the 1970s.
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They're just about big enough to ride on. Only intermittently open, check ahead on their website.