Built from a preexisting Moorish fort by the powerful local Feria house, Feria's impeccably revamped 15th-century castle enjoys spectacular panoramas in every direction from its hilltop perch; climb up onto the roof of the Torre del Homenaje for the full view. Inside, spread over three floors, is the excellent Museo Señorío de Feria, with detailed Spanish-language displays on the Feria family and its other nearby castles.
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.