br pDrone footage captured amid a heatwave close to the 5000-year-old Newgrange neolithic passage tomb in County Meath, Ireland, on July 10 revealed an previously-undiscovered henge, sparking an investigation by the country’s National Monument ServiceappThe footage was shot by Ken Williams in Brú na Bóinne, or the Boyne Valley, an area rich in neolithic sites and which was designated a a UNESCO World Heritage Site in 1993.ppWilliams said that were it not for the recent heatwave and drought in the area, the remains of the henge would not have been seen.ppAccording to Irish mediaa, the henge may have been built around 500 years after Newgrange, which dates back to 3000 BC.