I did the Mad Max tour from Bath last July, and it was great. I was expecting a BIG FENCE at Stonehenge. Instead, it was a little rope around the perimeter of the stones that I didn't find at all distracting. Avebury is much larger, but the stones are spread over such a large area that you'd need to view it from the air to see all of it. I am sorry I'll just be passing through the UK as I change planes at Heathrow next May.