Castalla Castle sits on a hill overlooking the valley and the town is around. Although its origins are Moorish, the current structure dates from medieval times. James I of Aragon took the castle from the Moors after the conquest of Biar and integrated it into the Kingdom of Valencia, under the Treaty of Almizra (1244), was in Castalla border with Castile. For this reason, started rebuilding the castle and was consecrated the first church in the place where the present chapel of the Blood.
The Torre Grossa tower was added in the 16th century in order to keep a lookout for pirate raids from the Mediterranean Sea.
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.