Adam's Grave

Adam's Grave was a Neolithic long barrow near Alton Barnes in Wiltshire, southwest England. Its remains have been scheduled as an ancient monument.
The barrow is considered to be of the Severn-Cotswold tomb type. These generally consist of long, precisely built trapezoidal earth mounds covering burial chambers, thus they are a type of chambered long barrow. The chamber, made of sarsen stones, contained partial human skeletons. An arrowhead was also recovered. There is a breast-shaped hill on the spot, with the remains of the barrow being 70 metres long and around 7 metres high with ditches on either side. It was partially excavated by John Thurnam in 1860. The area around Adam's Grave has a high density of long barrows and is important because of its archaeological potential.

Wikipedia