Following on from CianMcLiam's link - I found this:

http://video.google.com/videoplay?docid=5346406026127957138&q=megalithic&pl=true

And there's a few more in the "Playlist" on the right... What a great new feature!

G x

PS:
http://video.google.com/videoplay?docid=-1748868581126663332&q=%22stone+circle%22&pl=true
http://video.google.com/videoplay?docid=8788766512138379265&q=%22stone+circle%22&pl=true
http://video.google.com/videoplay?docid=4756770458787086625&q=%22stone+circle%22&pl=true
http://video.google.com/videoplay?docid=1116973708579368204&q=%22stone+circle%22&pl=true
http://video.google.com/videoplay?docid=212442817078638365&q=%22stone+circle%22&time=30000&pl=true and
http://video.google.com/videoplay?docid=-5069369944469548448&q=avebury&pl=true

Etcetera!