Fénis Castle (Italian: Castello di Fénis, French: Château de Fénis) is an Italian medieval castle located in the town of Fénis. It is one of the most famous castles in Aosta Valley, and for its architecture and its many towers and battlemented walls has become one of the major tourist attractions of the region. The castle first appears in a document in 1242 as a property of the Viscounts of Aosta, the Challant family. At that time it probably was a simple keep surrounded by walls. From 1320 to 1420, under the lordship of Aymon of Challant and of his son Boniface I of Challant, the castle was expanded to the actual appearance.