Not sure if it will show for you, but on map there is a golden mark that says "hidden cellar" if you point your cursor on it. If you travel there you will find a black boulder that you can hit to destroy and reveal the trap door under which the citizens are hidden. However you will need the key for this door which can be found in one of the beehives behind the wizard's house. (Nolan would have told you all of this had he lived
