Château Vallaise was the most sumptuous residence of the Arnad family of the same name. It was acquired by the regional administration in 2010 together with the Lower Castle of the Coast, the Upper Castle (or "Castellaccio") and the surrounding land.
The castle is currently closed to the public and is the subject of initial preparatory interventions for its restoration and enhancement, made possible through the use of community funds and proceeds from the Lotto game.
The Lower Coast castle is located to the west of Vallaise Castle.
It was built when the Vallaise family abandoned the Upper Castle for this residence and the Casaforte de Ville. Called the "domus fortis de la Costa", it already appears in a charter from 1462. In a will from 1487 it is defined as "domus nova de Costa", evidently because the memory of its construction was still preserved.
The two castles were connected by a covered gallery.