Philip B.
Google
Lovely hike to get to it from the A4 lay-by. Although don't do what I did and go as the sun is setting, as you'll have trouble getting back. But great sight to see if you're in the area. Takes 15-20 mins to have a nice pace up with the hill, and the same sort of time back down. Free to see, and if you time it right, it can be empty. From here you can see Silbury Hill too.