Out of curiosity, do you believe in ghosts? I have read two of these, and couldn't quite decide if you were mentioning ghosts in a skeptical or interested way. I live in a historic (tourist) area that loves to pump up its ghost-lore. According to all that, 3AM is the witching hour. At that hour -ghost or no ghost - sloppy ground, barbed wire, and ferocious sheep would be much more terrifying :)
Nature reclaiming stone structures is always fascinating.