Castello Sforzesco

Aside from being a wonderful example of a castle, the Castello Sforzesco has one of the best museums I Known about. It has huge rooms filled with incredible vintage musical instruments. from an ivory oboe, to rooms filled with violas, violins, cellos, etc. And the musical section is just part of the museum I would have spent the whole day just in awe. Along with the Duomo Cathedral, it's a must see in Milan.