I returned here to show a friend the site and this visit was even more rewarding than the last. What strikes me most with Bryn Celli Ddu is the mysterious stone, a remnant of the earlier stone circle, within the chamber – I’ve had dreams about it, and seeing it here again just knocks me out. The mound is nowhere near the size of the major Boyne Valley sites, but it is somehow reminiscent, and definitely every bit as stunning.