Oña is remarkable village since the times
of Fernán González, it grew under the protection
of the monastery of San Salvador and the grace of the monarchs.
In addition to the arch of Estrella, the fortified walls, and the church of San Juan, it is worth a visit the church of San Salvador, which still has some Romanesque windows, and a Gothic-Mudejar arch. The interior is richly ornamented, specially the royal pantheon, where lie the remains of Sancho el Mayor of Navarre and Sancho García. A historic play called "El Cronicón de Oña" is staged there in the summer.
Source: Web server of Instituto de Turismo de España, TURESPAÑA.