FilmFans: I'm not finding much time to maintain the easy-to-maintain caches, so this one I need to admit won't be coming back. It's hard when the city removes the feature that your waypoint was attached to, and the puzzle is difficult to adjust to a new location.
Of my own puzzles, this will probably remain my favorite, even though it didn't turn out exactly as elegant as I'd hoped when I first had the idea.