Tom,
While living in Virginia, my oldest daughter and I visited many battle sites and cemetarys. She often saw and heard things that could not be explained. I often had the feeling we were not the only ones there. She spent one day making faces at, " that soldier over there, who missed his little girls big much", He's a teacher back at home. I didn't see him! She carried away a pebble from the site and said he had given it to her as a "remembrance token", at four and a half I found this a little chilling. She was a precocious child but the words were still beyond her!
but that's just us.  BJ