Castello di Gran is located near the homonymous village, which is part of the municipality of Brusson in the Italian region of Val d'aosta. It occupies the summit of a rocky outcrop which dominates the Brusson and the greater part of Val d Aias. In the Middle ages the message of the castle was carried out using the check boxes or mirrors from nearby Torre di Bono and Castello di Villa in the town of Challand-Saint-Victor. Today a popular tourist attraction in Castello di Gran not only its architecture and cultural heritage, but also a legend about buried in its bowels the treasures.

Fief Gren appears in historical documents for 515 years, when king Sigismund of Burgundy gave his newly created Swiss Abbey of San Maurizio. Probably the monks of the Abbey in the 11th century and built a castle with a Romanesque chapel, which survived until our days. In 1263, the year the Abbey sold the castle to a faithful vassal of the Savoy dynasty godefroid di the Challans, the family which owned the Castello di Gran until the 18th century. This castle was the stronghold of Katharina di Challans in its struggle for the family inheritance. When in the 19th century, the family Challans ceased to exist, the castle became property of the family d Andrew, which later sold it to the municipality of Brusson. And in the early 20th-century medieval building has been carefully restored Alfredo d Andrade and Giuseppe Giacosa.

In its form Castello di Gren is a typical early medieval castle of Val d'aosta. Once he was surrounded by defensive walls dimensions 80x50 yards and had a number of different structures like a huge dungeon and the little chapel, which has reached our days. Side of the donjon – the square tower was the size of over 5, 5 meters in length. He served as the main tower of the castle and the residence of the caretaker. The entrance was at the height of 5 meters above the ground, and get inside it was possible only with the help of a ladder, which was cleaned in case of siege. Later to the tower to increase a separate wing was added.

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