Castillo de Sarracín is a castle-fortress located near the village of Vega de Valcarce in Spain, situated on the most ancient European pilgrimage route known as the way of Saint James – El Camino de Santiago.
The castle was built around the 9th Century and was used by the Knights Templars to protect the pilgrim routes. The castle has been used until the 16th century and has been abandoned ever since.
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.