Castello Ussel, perched on a cliff above the town of châtillon in the Italian region of Val d'aosta, is an interesting combination of strength and aristocratic residence. It was built in the mid 14th century on the orders of Ebalo II Challans, and today is a fine example of fortress architecture of the Aosta valley is the first castle, consisting of a single structure that grew out of the medieval buildings. For several centuries it passed from the hands of the family of Challans to the house of Savoy and back, then was turned into a prison, and later abandoned altogether. In 1983, the year the Baron Marcel beach, then owner of the castle was handed over to the ownership of the Autonomous region of Val d'aosta. In those same years, the Castello Ussel was restored and converted into an exhibition centre.

Having a huge rectangular base Castello Ussel is a superb example of stone construction with false arches and a beautiful double-arched Windows, decorated with floral and geometrical ornament. The corners on the South side, facing the mountain, are two round towers, which were originally connected by a covered walkway. On the same side is the entrance with a horizontal arrow at the top. On the North side of the castle, looking at Chatillon, you can see two quadrangular tower with an observation tower in the middle is a symbol of feudal power. And inside up to the present day remained cumbersome fireplaces with huge consoles, placed in the ascending line to use the only chimney.

When in the Castello Ussel began restoration work, the castle was in ruins. Accurate reconstruction of missing parts contributed to a thorough archaeological excavations. In the 1980s, between the towers of the castle was magnificent covered passage – "Cammino di Ronda", where today tourists can admire the plain of châtillon and its historic structures.