Casco histórico de Orduña Monument · Urduña/Orduña, Arratia-Nerbioi, Bizkaia The historic complex of Orduña, which preserves the layout of a trading town on the route between Castile and northern Europe, was declared a conjunto histórico-monumental in 1997. At its center lies the Plaza de los Fueros, arcaded and considered the largest arcaded market square in the Basque Country. declarado en 1997 Photo: User:Javierme Javier Mediavilla Ezquibela (CC BY 2.5) What to see and do in Urduña/Orduña