A few years back archdrude Julian Cope wrote an excellent book about megalithic sites in the British Isles. It's an amazing piece of work, well-researched, beautifully illustrated and authoritative. A website based on the book as been established at www.themodernantiquarian.com and now contains one of the best Google mapping projects I have ever seen. Their KML (Google Earth) file contains the location of every megalithic site on these islands, and over much of Europe. It really is an impressive project and I strongly recommend a browse.
Author: Sean Clark