Church of la Transfiguración de Traspeña Monument · Castrejón de la Peña, Montaña Palentina, Palencia A thirteenth-century church in Traspeña de la Peña, beside which a boundary cross of Roman origin is preserved; the two elements sum up the long settlement of this valley at the foot of the Sierra del Brezo. Photo: Valdavia (CC BY-SA 3.0) What to see and do in Castrejón de la Peña