Ghirlandaio Last Supper at Ognissanti
Leonardo da Vinci studied Ghirlandaio's fresco depiction of the Last Supper which can be viewed on specific days in the cloister of the Chiesa di Ognissanti in Florence. I haven't seen Leonardo's famous rendition in person, but I suspect that Ghirlandaio's is the more beautiful example, while that of da Vinci will necessarily be more symbolic and enlightened.
Surprisingly, non-flash photographs were allowed in the cloister chapel.
In the actual church of Ognissanti - which translates as All Saints - is a rather good painting by Ghirlandaio of Saint Jerome / Geronimo / Gerolamo.