San Salvador Monastery –founded in 1011 by the count of Castile D Sancho García- is the gem of Oña. In terms of architecture, its oldest elements  -the west façade and the chapter house- are Romanesque, from 11th and 12th-centuries. Once inside, the main chapel is impressive. Its Gothic-Mudejar vaults of royalty and nobility are unique within European Medieval funeral art. The tombs were constructed in 15th-century of walnut and boxwood and belong to Castilian counts and countesses, kings and queens of Castile and Pamplona and Castilian princes. The walnut Gothic choir stalls and St Iñigo’s Baroque chapel are also remarkable. All these pieces are under a spectacular eight-point star-shaped vault built by Juan de Colonia.

The sacristy is a museum which exhibits several Baroque altarpieces, gold and silverware items, and two Medieval shrouds from 10th and 12th-centuries.

The beautiful Flamboyant cloister, by Simón de Colonia, is the family vault of the counts of Bureba.

Oña’s town center, declared officially a Historic-Artistic site, has a real Medieval flavour. There are only a few sections left of the former medieval wall, together with the Estrella arch the only remaining entrance, and one of the oldest. Another interesting monument is the parish of San Juan, whose Gothic tower hosts the Resin Museum. The old Jewish quarter is located in Barruso St.

In August El Cronicón de Oña –a theatrical representation which commemorates the origin of Castile and the creation of Oña’s Monastery- takes place, providing a palpable sense of atmosphere of the Medieval times.