 After being subject for a long time to the influence exerted by San Maurizio al Lambro (which is now part of the municipality as a hamlet) Cologno received the honorary title of city with a presidential decree on September 19, 1996.Sights in Cologno include Villa Casati, the seat of the comune, and San Giuliano, a medieval Romanesque church.Part of the commune is included in the Media Valle del Lambro Park.