The castle of Castelnovo Val Tidone is a fortress built on the remains of a previous castle (hence the name "Castelnovo"). In 1155, the structure hosted Frederick Barbarossa, the famous emperor of the Holy Roman Empire. The castle of Castelnovo has undergone several destructions and reconstructions due to battles and sieges. Despite this, it has well maintained the original fourteenth-century structure, refined in the interior between the eighteenth and nineteenth centuries, when it became the country residence of the Marazzani Visconti family. At the end of the 19th century, extensive restoration work was carried out on the structures. The fort, built almost entirely of bricks, has a trapezoidal layout with three circular towers at the corners. The curtain walls and the towers with Ghibelline battlements have a significantly raised slope compared to the level of the moat. The entrance opens into the north-west façade, where the drawbridge protected by a low crenellated tower was originally located. Also noteworthy is an elegant courtyard with a travertine well dating back to the 16th century. Despite the various reconstructions, the prevailing military character of the castle is still recognised, with references to fifteenth-century Lombard architecture. A vast park surrounds the manor, with centuries-old trees and some eighteenth-century statues.