It is the village as a whole rather than any particular sight that is appealing, although you would not want to miss the watchtower and the remarkably narrow street past it.
The only way to see the village is on foot. It's small enough to give no problem to most people but is not easy for wheel-chair users as there are a number of steps and some very narrow roads.
Photos from Santo Stefano, Italy
Hotel Restaurant del Cavaliere,Via della Giudea, This is just outside the wall; their lentil soup is particularly good.