Festivities of invierno de Samper del Salz Activity · Samper del Salz, Campo de Belchite, Zaragoza Image of Samper del Salz, not of the place itself. Samper del Salz's winter festival is held beside a 13th-century mill with its medieval aqueduct and weirs, and the 17th-century church of San Pedro, with a Greek-cross plan and a Baroque brick tower. Photo: Millars (CC BY-SA 4.0) What to see and do in Samper del Salz