The Fatetar Castle is located on the top of the Monte Fatetar, in the highest part of the town and enyoy stunning views of both, the village and its surroundings.
Apparently the Fatetar Castle was built by Abderrahman III in 914. Though its origins are not well known, many cultures haved passed through this place, such as the Romans, Visigoths, Arabs, Muslims and Christians. Today you can still observe its keep and the remains of its walls.
The Chapel of the Holy Christ of Antigua is located adjoining the west angle of the Fatetar Castle which stands on the summit of a hill north of the Espera town, with which it forms and architectural unit. The Chapel of the Holy Christ of Antigua served as a church to the inhabitants of the town until the consecration in the early seventeenth century, the Church of Our Lady of Grace, with the patronage of St. James, patron of the Christian Reconquests, wich suggests its pssible construction by the first Spanish forces that garrisoned the castle from the second half of the thirteenth century.
References:The Walls of Constantinople are a series of defensive stone walls that have surrounded and protected the city of Constantinople (today Istanbul) since its founding as the new capital of the Roman Empire by Constantine the Great. With numerous additions and modifications during their history, they were the last great fortification system of antiquity, and one of the most complex and elaborate systems ever built. They were also the largest and strongest fortification in both the ancient and medieval world.
Initially built by Constantine the Great, the walls surrounded the new city on all sides, protecting it against attack from both sea and land. As the city grew, the famous double line of the Theodosian Walls was built in the 5th century. Although the other sections of the walls were less elaborate, they were, when well-manned, almost impregnable for any medieval besieger.