So how did they manage to drag them from West Wales?
Only some of them, the Blue Stones.
And they took them by raft around South Wales, across the Severn to Avonmouth, up the Avon, probably to roughly where Melksham is now, then dragged them across country to about where Pewsey is, and floated them down the South Wiltshire Avon to where Amesbury is, then dragged them the last bit across country to where they now stand.
The main Sarcen stones came from roughly the same place as the Avebury stones, Fyfield Down, but the Stonehenge stones were worked into shape, rather than left rough; they’re easier and lighter to transport, and arrange into the henge.
Seeing as how the Stonehenge sarcens are about a quarter of the weight of some of the biggest Avebury stones, at 20-25 tones, they could possibly even have hauled two at a time, though that’s highly unlikely!
Oh, and there’s one stone at Avebury that’s right by the gate on the left as you walk along the Herepath from opposite the pub which is reclining, and has a polished smooth surface, from many years of kids sliding down it…
They won’t let you do that at Stonehenge!