Awesome writing, I feel it. Yes most 'castles' are now earthworks and there are quite a few plague villages that are nothing but earthworks too, since they were totally abandoned. I get what you mean about the psychic geography, i kinda felt that when I went to that WW2 crash site in the peaks that time, the one with aluminium and engine parts strewn everywhere. Britain is ancient and the land is etched by current and previous human presence. Did you get any of these feelings at Glastonbury Tor?