Nogales, Spain
15th century
Monroy, Spain
14th century
Galisteo, Spain
13th century
Casas de Reina, Spain
12th century
Alange, Spain
9th century AD
Brozas, Spain
14th century
Alconchel, Spain
12th century
Villagarcía de la Torre, Spain
15th century
Capilla, Spain
13th century
Villalba de los Barros, Spain
15th century
Hornachos, Spain
11th century
Valencia del Ventoso, Spain
c. 1477
Cáceres, Spain
15th century
Mirabel, Spain
15th century
Zarza la Mayor, Spain
13th century
Medina de las Torres, Spain
14th century
Montemolín, Spain
12th century
Portezuelo, Spain
c. 1150
San Vicente de Alcántara, Spain
14th century
Aldea del Cano, Spain
13th century
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.