Santa Maria delle Grazie combines Solari’s Lombard church with the great tribune traditionally associated with Bramante and a Dominican complex still used for worship. The refectory preserves the Last Supper under tightly controlled museum access.
The painting’s experimental technique produced early deterioration. Damage, environmental exposure and repeated restorations mean that the visible surface is the outcome of survival and conservation, not a pristine Renaissance object.
The Ambrosiana and science museum provide different forms of evidence: original sheets and paintings on one side, later physical models and interpretive galleries on the other. Both are valuable when labelled accurately.
Reserve the constrained refectory visit first, then build the rest of the day around churches, manuscripts and museums without turning every mechanical model into an original Leonardo object.