Solza is a comune in the Province of Bergamo in the Italian region of Lombardy, located about 35 kilometres northeast of Milan and about …Solza is a comune in the Province of Bergamo in the Italian region of Lombardy, located about 35 kilometres northeast of Milan and about 14 kilometres west of Bergamo. Solza borders the following municipalities: Calusco d'Adda, Medolago. It is the birthplace of medieval condottiero Bartolomeo Colleoni.