Was just talking about this with DH earlier. I remember going on a visit to Edgehill as a child and finding it really spooky. We'd been watching videos in school about the Civil War and there was talk of the phantom armies etc, so I think it was a combination of that and how strange it was that all these nice quiet green fields were once a battlefield
The second place was a ruined abbey in Ireland. Lovely sunny day when we visited, but my skin was crawling the whole time we were there and I kept feeling as though there was something peeping at me fron behind the walls