Gilwern Hill, Powys

Gilwern Hill, about 5 km southeast of Llandrindod Wells in Powys, Wales, hosts a Neolithic-Bronze Age stone circle of approximately 14 stones, half of which have fallen. The hill also features two prehistoric stone rows at its southern end, each terminating in a large stone over 2 metres high. A separate standing stone of the needle type stands in peaty ground on the hill. The site is composed of Ordovician volcaniclastic rocks forming part of the Builth Inlier, also notable for trilobite fossils.