English: Summer solstice at Bryn Celli Ddu burial chamber, Llanddaniel, Anglesey. The chamber dates from the neolithic period, and aligns perfectly with the rising sun of the summer solstice. The Anglesey Druid Order still celebrate the event each year. Anglesey was the centre of the Druid world, and was the last remaining stronghold in the face of Roman expansion until the brutal invasion of Anglesey in AD60.