Initially, it consisted of a tower, a connecting wall, and a chapel dedicated to Saints Efisio, Mark, and Eusebius.

The castle’s location was of great military importance, as it allowed control over the access route to the Aosta Valley and the Via Francigena.

[1] In the 19th century, the castle was renovated under the direction of architects Carlo Nigra and Alfredo d'Andrade, who also used it as a model and source of inspiration when designing the Borgo Medioevale in Turin.

[1] The castle's square keep, which served as its main defensive stronghold, is integrated in the walls on the northern side of the structure, which is further reinforced by four round corner turrets.

The chapel is a small structure, with its southern façade featuring remnants of 15th-century frescoes, including an image of Saint Christopher, attributed to Giacomino da Ivrea, and a depiction of the Madonna nursing the Child.