The history of the Castle can be summarized as follows: built towards the end of the 1300s by order of Gian Galeazzo Visconti, it was strengthened towards the end of the 1400s by the Sforza family who, in the meantime, had conquered power. The Sforza family added other parts to the main body, which remained so until the sixteenth century, a time when the Castle, by the Gattinara family, was transformed into a comfortable residence, which has not undergone substantial changes to this day. Typical quadrilateral layout, with moat, internal courtyard and four corner towers. The castle is the main attraction of the village and currently houses the "Lomellina Study and Documentation Center", the "Sartirana Arte Foundation", with the museums of collections of silver, jewels, objects of peasant culture, art graphics. Both the Study Center and the Foundation organize numerous exhibitions and cultural events at an international level. In 1462-1463 under the Sforza, the Castle underwent military transformations of expansion and consolidation of the round tower, which was dealt with by the famous architect Bartolomeo Fioravanti, the same that Ivan II, Tsar of Russia, called to his court to the construction of the Kremlin defenses. Sartirana and its castle then passed to the Spaniards with Mercurino Arborio (cardinal) until his death in 1530. The castle belonged to the Arborio dynasty until 1934, and then to the Duke of Aosta Amedeo di Savoia.