Thought to date to around 200BC this pair of standing stones rise to a height of about eleven feet, are approximately ten feet apart and are located at the base of Holyhead Mountain (Welsh: Mynydd Twr). It is not clear what their significance was but possibly they are aligned to other significant landscape features in the area. They can be accessed from a minor road between South Stack and Trearddur southwest of Holyhead, Anglesey (Welsh: Caergybi, Ynys Môn).
Link: Cadw Penris Feilw Standing Stones
Image:Penris Feilw Standing Stones courtesy of Cadw