The Penrhos Feilw Standing Stones are on Holy Island Anglesey to the south west of Holyhead. Both stones stand almost 10 ft, 3 m, high and stand roughly the same distance apart. This pairing of stones is rare in Anglesey but does occur in south Wales. Some claim that the pair of stones are part of a more complex monument with a burial cist between them. They are estimated to be of the 2nd millennium BC.....