The Prehistoric and Protohistoric Collections of the Archaeological Museum of the Castello Sforzesco are located in the underground rooms of the Ducal Court of the Castello Sforzesco in Milan . The Museum, with the support of numerous didactic panels, illustrates the evolution of the territory step by step, from the Neolithic to the Roman colonization.

The path of the Archaeological Museum opens with the Neolithic and its technological innovations. Chipped and polished stone tools found in the Lombardy region document stone processing from the 6th to the 4th millennium BC

The Bronze Age follows (in northern Italy, 2200-900 BC), characterized by the working of copper and its alloys and the use of the plow and the cart. The museum itinerary continues with the testimonies of the Late Bronze Age (XII-X century BC) and the first Iron Age.

The Golasecchian communities developed a progressive urbanization that took place in the 6th and 5th centuries BC and a complex social stratification. Since the 5th century they have been operating as mediators of exchanges between the Mediterranean and Celtic Europe, reaching a high degree of wealth concentrated in the hands of an aristocratic elite, who lays in the tombs grave goods of particular beauty, such as that of Sesto Calende.