Master Painter Leonardo da Vinci
Yes, The Louvre has The Mona Lisa painting with 10's of 1,000's of artifacts in one of Paris's greatest museum, however if you want to see The Last Supper painting by the same master painter Leonardo da Vinci, you need to take a short cab ride from the center of Milan to a simple neighborhood church called Santa Maria delle Grazie (Holy Mary of Grace) which houses only this one painting.
Once there, you will go through several humidity free rooms before you come face to face to one of the greatest paintings in the world. The room where the mural painting hangs for public viewing is as large both in width, length and height as a NBA basketball court. The paintings size is 15 feet by 29 feet. Approximately 10 people at a time can go in at once and you must buy tickets weeks in advance on-line if you want to be one of the lucky persons to get this semi-private viewing.