The monastery of San Juan de la Peña is a religious complex in the town of Santa Cruz de la Serós, at the south-west of Jaca, in the province of Huesca, Spain. It was one of the most important monasteries in Aragon in the Middle Ages. Its two-level church is partially carved in the stone of the great cliff that overhangs the foundation. San Juan de la Peña mean…The monastery of San Juan de la Peña is a religious complex in the town of Santa Cruz de la Serós, at the south-west of Jaca, in the province of Huesca, Spain. It was one of the most important monasteries in Aragon in the Middle Ages. Its two-level church is partially carved in the stone of the great cliff that overhangs the foundation. San Juan de la Peña means "Saint John of the Cliff".