Double postings - okay I'm not awake this morning, but for those who live in Wales interesting stuff about Skomer Island appears in the middle of this programme which went out on the 10th feb, it has 'untouched' prehistoric stones aplenty. The second link gives you some info, scroll down.
http://www.rcahmw.gov.uk/HI/ENG/Heritage+of+Wales/Hidden+Histories+III/Episode+4/
Edit; thank you Eds for deleting the other post...