San Vicente de la Barquera, Spain
13th century
Manzanares el Real, Spain
1475
Frías, Spain
9th century AD
Cádiz, Spain
17th century
Almería, Spain
c. 955 AD
Toledo, Spain
13th century
Alcalá la Real, Spain
13th century
Antequera, Spain
14th century
A Coruña, Spain
16th century
Cádiz, Spain
18th century
A Coruña, Spain
13th century
Estella, Spain
13th century
Hornos, Spain
13th century
Toledo, Spain
0-100 AD
Burgos, Spain
c. 865 AD
Almodóvar del Río, Spain
8th century AD
Javier, Spain
10th century AD
Salobreña, Spain
10th century AD
Pamplona, Spain
1571
Xàtiva, Spain
11th 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.