Alguns tipos de sítios arqueológicos - "Stone Circles"

Vejam por exemplo:
http://en.wikipedia.org/wiki/Stone_circle
(fonte também da imagem:
Swinside stone circle, in the Lake District,
England)
http://www.answers.com/topic/stone-circle

http://bbs.keyhole.com/ubb/showflat.php?
Cat=&Board=EarthHistory&Number=845117&Searchpage
=1&Main=831540&Words=+LuciaM&topic=&Search=true

http://www.timetravel-britain.com/07/April/avebury.shtml

http://www.welshpedia.co.uk/wiki/wales/index.
php?title=Stone_Circle

http://www.megalith.ukf.net/bigmap.htm

etc!