Castillo-Palacio de Marcilla Monument · Marcilla, Ribera Alta, Navarra A 15th-century Gothic fortress with a square plan and corner towers, built in brick on an ashlar base. It held the sword Tizona, traditionally attributed to El Cid, until 1947, and was restored in 2012. s. XV; 1947; 2012 Photo: Diego Delso (CC BY-SA 4.0) What to see and do in Marcilla