Opera is a comune in the Metropolitan City of Milan in the Italian region Lombardy, located about 10 kilometres southeast of Milan. Opera bor…Opera is a comune in the Metropolitan City of Milan in the Italian region Lombardy, located about 10 kilometres southeast of Milan. Opera borders the following municipalities: Locate di Triulzi, Milan, Pieve Emanuele, Rozzano, San Donato Milanese. It is home to the early 13th century Abbey of Mirasole.