Do you know, right off the top of your head, if Glastonbury Tor has been a topic of one of these GGG threads? I'll probably do a search sometime, when I have more time - it's something that intrigued me when I saw a photo a few years ago...
Gods, Graves, Glyphs (alpha order)
Gods, Graves, Glyphs | 7/17/2004 | various
Posted on 07/17/2004 2:27:10 AM EDT by SunkenCiv
http://www.freerepublic.com/focus/bloggers/1173106/posts
Was Arthur a king or just a battle commander?
King Arthur: A Man for the Ages | undated | David White
Posted on 11/06/2005 10:31:28 AM EST by Hacksaw
http://www.freerepublic.com/focus/f-news/1516742/posts
Alas, Glastonbury is not manmade, although there are huge hills there.
ALSO google to find the program "Standing with stone".