The monastery of San Juan de la Peña (Saint John on the Cliff) is a religious complex in the town of Santa Cruz de la Serós.
San Juan de la Peña is one of the most important monasteries in Aragon in the middle ages.
The monastery was built in the huge cave on a steep cliff.
The lower church includes some Mozarabic architectural surviving elements.
Legend said that the chalice of the Last Supper, Holy Grail was sent to the monastery for protection and prevention from being captured by the Muslim invaders of the Iberian Peninsula.
The impressive cloister, under the great rock, is really a masterpiece of splendid Romanesque.
I went out of the monastery and gazed overhead at steep cliff, then left.