Seville, Spain
1414
Murcia, Spain
1702-1738
Corias, Spain
1032
Narón, Spain
12th century
Ávila, Spain
1478
Hortigüela, Spain
912 AD
Gradefes, Spain
1168
La Vid y Barrios, Spain
1152
Vélez-Málaga, Spain
1555
Esgos, Spain
573 AD
Tordesillas, Spain
1344
San Pedro de las Dueñas, Spain
10th century
Salas, Spain
1024
Jerez de la Frontera, Spain
1475
El Puerto de Santa María, Spain
16th century
Córdoba, Spain
15th century
Santiponce, Spain
1301
Meira, Spain
12th century
Castro Caldelas, Spain
12th century
San Miguel de las Dueñas, Spain
10th 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.