Monasterio de Santa María la Real de La Oliva Monument · Carcastillo, Zona Media, Navarra The first Cistercian foundation in the kingdom of Navarre, affiliated with the abbey of Morimond through Escaladieu, founded around 1150 under King García Ramírez. Its church, in Romanesque-to-Gothic transitional style, was built between 1164 and 1198; the Gothic cloister dates from the 14th-16th centuries. Declared a Monumento Nacional (National Monument, the heritage protection category used in Spain until 1931) on 24 April 1880, it is today a Bien de Interés Cultural (Spain's highest level of heritage protection) (RI-51-0000026). Since 1927 it has housed a Trappist community and has a guesthouse. h. 1150; Monumento Nacional 24 de abril de 1880 Photo: Diego Delso (CC BY-SA 4.0) What to see and do in Carcastillo