Drosso Castle was built in the early 13th century as a Cistercian farm affiliated with nearby Staffarda Abbey. In the following century, it was transformed into a fortified castle with turrets. It was later purchased by the Gromis family, who still own it today. They converted it into an elegant residence for noble guests visiting the nearby ducal palace of Mirafiori. The castle has a square brick structure with three floors arranged around an enclosed courtyard. Although it looks fortified, with a loggia on the western side, it originally had just two towers facing north. The south-east corner was occupied by the bell tower of a chapel.