Bryn Gwyn Standing Stones

The Bryn Gwyn stones stand about 280 metres to the south-west of Castell Bryn Gwyn, on the low ridge some 2 m above the valley of the Afon Braint on the Isle of Anglesey in Wales.

They are the tallest standing stones in Wales, nearly 4 m high. In 1723 Henry Rowlands described them as part of a ruinous circle of eight stones, some 16 m across. An account of 1797 says that "ignorant country people supposing money was hid under them tore them up" and today only two stones, one slab and one pillar, stand in a modern field bank. Nothing else is visible on the ground, but a 2008 excavation found three pits of standing stones, two containing stone stumps, consistent with the record by Rowlands.

Source: Wikipedia