Peñafiel castle is built of Campaspero stone and is an example of the German Gothic style. It is 210 metres long by 33 metres wide.The castle is located on a hill overlooking the valleys of Duratón and Botijas. Its exterior is uniform in appearance, and it has a single door. http://www.spain.info/en_IN/que-quieres/arte/monumentos/valladolid/castillo_de_penafiel.html