Wine cellar quarter of Baltanás Monument · Baltanás, El Cerrato, Palencia The complex of underground wine cellars of Baltanás, with 374 cellars spread over six superimposed levels, is the largest such complex in Spain and is listed as a Bien de Interés Cultural (Spain's highest level of heritage protection) in the ethnological-site category. It is located on the cerro del Castillo, in a strategic position overlooking a fertile valley, which earlier housed a medieval castle and an early urban settlement; as the population moved down to the plain, the original settlement became a district of cellars on the upper part, in continuity with the present-day town through the church of San Millán. It is spread over two areas, that of the Castillo, with 305 cellars across 3.5 hectares, and that of Las Erillas, with 69 cellars in one hectare, already mentioned by the geographer Madoz in the 19th century. Photo: Carmen García Fdez (CC BY-SA 4.0) What to see and do in Baltanás