The Church of Santa Maria della Grazie is the home of the famous Leonardo the Vinci artifact, the Last Supper. Only 25 people are allowed to view the painting at a time and usually a reservation is a must. The church is about 20 minutes walk from Galleria Vittorio Emanuele. That is a lot of walking but you can ride a bus too!
On the back side of Santa Maria della Grazie is an nice exhibit in the Bramante Sacristy. Here houses the exhibition of Leonardo’s Codex Atlanticus, an exhibition that has hand drawings from Da Vinci himself. It is well worth the 10 euro admission. Click here for a pretty cool Google street inside view of the exhibition.