On our walk up Mam Tor, we passed a number of 'markers', set into the pathway. They were representations of objects from the Iron Age; because at the top of Mam Tor there had once been an Iron-Age fort.
I particularly liked this one, which is an image, etched into metal, showing what an Iron-age fort may have looked like.
I wished I'd have had some sheets of paper and a big stick of graphite with me, so I could have done some rubbings from the metal casts of the markers.
I had to make do with a photo.