Festivities of Aísa Activity · Aísa, La Jacetania, Huesca Image of Aísa, not of the place itself. Aísa's festival is held in a valley where, in Esposa, artisan sheep's-milk cheeses are made, matured in natural chambers, heirs to the old cheese-making tradition of the mountain-pass shepherds. Photo: Frank Markesteijn (CC BY-SA 4.0) What to see and do in Aísa