Thanks to Goff for this one.
For those unable to get to Avebury as often as they might like, this is a useful tool for exploring the Henge (might take a few seconds to load) -
http://maps.google.co.uk/?ie=UTF8&ll=51.428491,-1.853803&spn=0,359.995177&t=h&z=18&layer=c&cbll=51.429131,-1.853932&panoid=H45A_ZEl-30QZAHaOxg00w&cbp=12,206.68,,0,4.7
For those unable to get to Avebury as often as they might like, this is a useful tool for exploring the Henge -