First built in the 13th century, but thoroughly altered in the 15th century, Ampudia Castle has a square plan with a gothic central courtyard and 4 towers on each corner. Half of the castle complex is surrounded by a barbican defended by cylindrical towers.
It belonged to different owners such as Juan Alfonso de Alburquerque, Sancho de Rojas and Pedro Garcia Herrera (Marsical of Castille) among others.
In 1521 it was assaulted and occupied by the Comuneros (Castillan independentists who fought against Charles I of Spain) headed by the belicious bishop Acuna. It was later retaken for the Crown by the Duke of Lerma.
Today Ampudia Castle is a private property, but its grounded departments can be visited on a guided tour. Other parts of the castle like the upper levels or the keep are not open for visit.
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.