Tŷ Mawr Standing Stone is about nine feet high and twists as it reaches the top. Probably Bronze Age in origin and is to the west of Trefignath Burial Chamber. It is close to the A5 and B4545 south of Holyhead (Welsh: Caergybi) towards Trearddur on Holy Island (Welsh: Ynys Gybi) an island on the western side of the larger Isle of Anglesey, Wales (Welsh: Ynys Môn, Cymru).
Link: Cadw - Tŷ Mawr Standing Stone
Image: Tŷ Mawr Standing Stone courtesy of Cadw