Castello di Gran is located near the village of the same name, which is part of the municipality of Brusson in the Italian region of Val d'Aosta. It occupies the top of a rocky cliff, which dominates the Brusson and mostly Val d'Ayyas. In the Middle Ages the castle was carried out a message using the check boxes or mirrors of the nearby Torre di Bono and Castello di Villa in the town of Challand-Saint-Victor. Today, many tourists are attracted to the Castello di Gran not only its architecture and cultural heritage, but also the legend of buried treasure in its depths.

Fief Gran appears in historical documents from the year 515, when King Sigismund of Burgundy gave his newly created Swiss Abbey of San Maurizio. Probably, it was the monks of the abbey in the 11th century and built a castle with a Romanesque chapel, preserved to this day. In 1263, the year the abbey to sell the castle loyal vassals Savoy Godefroy de Shallanu, whose family owned the Castello di Gran until the 18th century. It was this castle was a stronghold of Catherine of Challant in its struggle for the family inheritance. When in the 19th century Challand race ceased to exist, the castle became the property of the family d'Entrev, which later sold it commune of Brusson. At the beginning of the 20th century medieval building has been carefully restored by Alfredo d'Andrade and Giuseppe Giacosa.

The shape of the Castello di Gran is a typical early medieval castle of Val d'Aosta. Once he was surrounded by defensive walls dimensions of 80x50 meters and had a number of different facilities like a huge dungeon, and a small chapel, which only reached our days. Parties to the keep - a square tower - have dimensions in excess of 5, 5 meters in length. He himself served as the main tower of the castle and the residence of the warden. The entrance is at the height of 5 meters above the ground, and get inside it was only possible with the help of a ladder, which was removed in the case of a siege. Later, the tower for its increase was attached a separate wing.

Also noteworthy is the medieval Romanesque chapel dedicated to St. Martin. It consists of a single nave length of 8 meters and a semicircular apse. Unfortunately, the ceiling of the chapel at the time collapsed and was never rebuilt.