Poznań, Poland
15th century
Grodków, Poland
13th century
Brzeg, Poland
1370-1420
Bielany, Poland
17th century
Tum, Poland
1140
Chojnice, Poland
14th century
Słupsk, Poland
14th century
Warsaw, Poland
1806
Tczew, Poland
13th century
Przemyśl, Poland
1627-1631
Tczew, Poland
14th century
Kartuzy, Poland
1380
Poznań, Poland
11th century
Głuchołazy, Poland
13th century
Dobre Miasto, Poland
1357-1389
Katowice, Poland
1510
Haczów, Poland
1388
Powroźnik, Poland
17th century
Chełm, Poland
1735-1756
Stargard, Poland
c. 1248
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.