Castrojeriz, Spain
9th century AD
Brión, Spain
9th century AD
Las Navas del Marqués, Spain
1533
Marcilla, Spain
15th century
Fuensaldaña, Spain
13th century
Spain, Spain
15th century
Valdegovía, Spain
c. 1400
San Martín de Valdeiglesias, Spain
15th century
Montemayor del Río, Spain
15th century
Cortegana, Spain
13th century
Mula, Spain
1524
Herrera del Duque, Spain
15th century
Tiebas, Spain
c. 1250
Vega de Valcarce, Spain
9th century AD
Álora, Spain
9th century AD
Vozmediano, Spain
14th century
Villafuerte, Spain
15th century
Curiel de Duero, Spain
7th century AD
Montealegre de Campos, Spain
12th century
Felanitx, Spain
14th 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.