CADW the Welsh body responsible for historic buildings and monuments have a very ingenious device for a DIY running commentary. You wind a handle for a few seconds and, hey presto! a voice, in Welsh or English (depending on which rotation you use) gives you historical facts. At Tinkinswood it told me about the existence of this cromlech so I just had to go and see. It stands high in the middle of a field. It too has legends attached - surprise, surprise! One legend has it that the wedge-shaped capstone spins three times each Midsummer's Eve.

This I must see! I have made a note in my diary!

Note: the links for this and Tinkinswood take you to an interesting site called The Stones of Wales