“The once celebrated Clachan an Diridh (’stones of the ascent’) lie, now almost forgotten, to the south of Pitlochry near the ridge of Carra Beag (’little rock’) and An Suidhe (’the seat’), which together are popularly known as Fonab Hill. At the begining of the twentieth century, the Clachan an Diridh stones would have stood majestically on bare hill and are now half hidden in a clearing, within forestry, but there are signs that after the Second World War trees were planted as close as a metre to each stone. Originally a four poster, although only three stones now remain, this site was visited on the first day of May each year, the religious rite being to go round the stones deiseil (’sunwise’-that is, clockwise).”
From “Pitlochry-Heritage of a Highland District” Colin Liddell 1993.