The Monastery of San Salvador was a Benedictine monastery in the town of Oña, in the province of Burgos, central Spain, founded in 1011, which lasted until the 19th century.
Wikipedia https://en.wikipedia.org/wiki/Monastery_of_San_Salvador_de_Oña
Address 4 Calle del Pestiño, Oña 09530, Spain
Coordinates 42°44'3.247" N -3°24'44.714" E
