Trigueros del Valle, Spain
14th century
Garrucha, Spain
1766
Soto del Barco, Spain
11th century
Muskiz, Spain
1339
Galisteo, Spain
13th century
Casas de Reina, Spain
12th century
Cortes de Pallás, Spain
14th century
Topas, Spain
15th century
Castillejo de Robledo, Spain
12th century
Cartaya, Spain
15th century
Lopera, Spain
11th century
Puente del Congosto, Spain
12th century
Cortes, Spain
12th century
Priaranza del Bierzo, Spain
9th century AD
Aqura de Emedio, Spain
18th century
Barrundia, Spain
13th century
San Felices de los Gallegos, Spain
13th century
Loja, Spain
9th century AD
Gaucín, Spain
10th century AD
Arcos de la Frontera, 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.