On top of the hill, there is a Neolithic chambered cairn, unusual for its position on top of a hill. Most surviving Neolithic British cairns are sited in prominent places, but not generally on the top of taller hills. According to local farmers, until the construction of Sullom Voe Terminal in the mid-1970s, the cairn contained a variety of sacrifice items, such as coins (some very old) and other items. Before that time, Ronas Hill would have been far off the beaten track.