Basílica de Santa María de Aibar Monument · Aibar/Oibar, Sangüesa, Navarra A Romanesque building with a single nave of four bays, covered with a pointed barrel vault over transverse arches. A Baroque main altarpiece from 1710 presides over the church. 1710 Photo: Iñaki LL (CC BY-SA 3.0) What to see and do in Aibar/Oibar