One of the things I do each day is go though the news online on a particular feed, well yesterday it came up with the news that the archaeologists Wainwright and Darvill had found a neolithic tomb by the Carn Meini rock outcrop - the supposed site of the bluestones used for Stonehenge. The tomb, with what looks like two upstanding stones is sited on top of an earlier henge, and the two archaeologists have put forward the theory that this may be the grave of the high ranking person who had the bluestones transported. Well there are always theories, weird or otherwise that revolve round prehistoric tombs, stone circles etc, and as there is no proof one way or the other there is a 'state of unknowing' as to what has happened in prehistory.
Even Wainwright says in the Guardian article that....it was a "jump" to claim the person buried there was an architect of Stonehenge. "It's a hypothesis but it could well be true. There is certainly something very significant about the grave."
There is a photo of the passage grave in the BBC news here, and perhaps one of my favourite links for the Preselis is the S.P.A.C.E. Landscape & Perception Project, which treats the subject in a more esoteric manner, and also has some good photos of the area.