It's super isn't it. It's hardly displayed in pride of place in the museum but it is dingy enough to be atmospheric. I often pop in to see it.

The Calderstones
http://www.btinternet.com/~m.royden/mrlhp/local/calders/calders.htm
are supposed to have foot prints on too, but I can't see a clear photo. It might be wishful thinking? I wonder if anyone here's seen them.