There is a stretch of the road that runs alongside the Loch of Skaill . It is practically devoid of detail apart from a quarry near one end . But what took my attention when I walked that way was the object whose image lies in posts 21675 and 21676 . It could always be natural , but I can't help but feel that this triangular niche is all that we can see of a structure from when the road was cut through the present bank . Any thoughts welcomed .