Festivities of el Valle de Hecho Activity · Valle de Hecho, La Jacetania, Huesca Image of Valle de Hecho, not of the place itself. Valle de Hecho's festival is held in a municipality where in 833 the count of Aragón Galindo Garcés and his wife Guldregut donated lands to the monastery of San Pedro de Siresa, the first written record of the monastery. Photo: Wikipedia / Wikimedia Commons (CC BY-SA) What to see and do in Valle de Hecho