Festivities of invierno de Plenas Activity · Plenas, Campo de Belchite, Zaragoza Image of Plenas, not of the place itself. Plenas's winter festival is held in the birthplace of Manuela Sancho, one of the heroines of the Sieges of Zaragoza, to whom an ethnographic museum is dedicated; it also preserves the church of Nuestra Señora de la Piedad, from the 16th century with an 18th-century Baroque tower. Photo: Pgp15 (CC BY-SA 4.0) What to see and do in Plenas