Iruña-Veleia Historical milestone · Iruña Oka/Iruña de Oca, Cuadrilla de Añana, Álava One of the most important Roman archaeological sites in the Basque Country, occupied from the Bronze Age until the 5th century. At its height it had some 10,000 inhabitants, making it the third-largest city south of the Pyrenees after Zaragoza and Tarragona. Photo: Txo (Public domain) What to see and do in Iruña Oka/Iruña de Oca