A friend, who is also a musician, posted something about the Dartmoor Folk Festival on FB yesterday - he's not really a stony person but seems a bit chuffed he will be playing at the Oxenham Arms, a pub built around a 5,000 year old standing stone. (He posted this link).
http://www.megalithic.co.uk/article.php?sid=8401
Is this very unusual - or are there other buildings that incorporate standing stones? (I know there are churches around the Avebury area that have sarsen corner stones).