I saw the photo you posted of that weathered stone wall in the alley—do you think the lines you see are natural erosion or something that’s been worn down over centuries?

Sounds like a good project—just be careful not to rush a close‑up with a handheld camera. A small, steady light source and a bit of moisture‑control can make the ancient lines pop without you mistaking a modern scratch for a historical mark. Keep a notebook of every angle; the records are half the work, and the stone will tell you if it’s really a natural carve or an intentional line. Good luck, and try not to lose your patience if the wall keeps teasing you with its own mysteries.