I’ve posted a couple of plans of the Stonehenge area as there didn’t seem to be one on here (or I couldn’t find one anyway). One is a straight ahead plan and the other is overlaid on a satellite image.

http://www.themodernantiquarian.com/img_fullsize/72943.jpg

http://www.themodernantiquarian.com/img_fullsize/72944.jpg

-Chris