Phosphorescence on the carved stones.
Image credit: A. Brookes (9.3.2017)
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Ah! You've been back to Anglesey. This is an amazing chambered cairn - I didn't manage to go inside when I visited, had to make do with looking through the locked gate.
So did we this time, an evening stroll as we were staying in Rhosneigr. We managed to get inside the previous time though as it was a open day.