I live not too far from Avebury, the largest Neolithic stone circle in the world though precious little of it is left. I've walked down there once or twice, a hike across the Marlborough Downs of a respectable but practical length, so I'm not unfamiliar with it. Like most people, I simply see the ring and surviving stones as is, pondering their mysteries but I guess not looking too deeply at them.
Here's a thought provoking video from a guy who does a bit of alternate thinking. I have no idea if he's right, but it shows Avebury and some surrounding areas in a very different light than I expected. Decide for yourself....