I know of a lovely cottage, up a little lane, with a Roman altar halfway up the wall - have I mentioned this one before ? And another with a pair of ballista decorating a porchway gable - it's an old schoolhouse. But you're alright looking for Rock art incorporated into walls unless you're I, when you get turds chucked at you for finding some. Horses for courses, I suppose - and I'm the only stonemason present ...