A friend and I visited this site on a whim while in the Cardiff area. The only other dolmen I’ve visited is the Devil’s Den near Avebury. St. Lythans struck me by its subtly glorious positioning – atop a gentle rise in a field on a gentle hill – but mostly by the marvellous pockered stones. They’re covered in amazing little dips and rounded, shallow holes, that give the monument a kind of Swiss-cheese-from-Mars feel.