Višegrad, Bosnia and Herzegovina
1343
Bihać, Bosnia and Herzegovina
15th century
Ravno, Bosnia and Herzegovina
16th century
Fojnica, Bosnia and Herzegovina
1668
Banja Luka, Bosnia and Herzegovina
1869
Srbac, Bosnia and Herzegovina
14th century
Kmećani, Bosnia and Herzegovina
16th century
Kozara, Bosnia and Herzegovina
12th century
Bileća, Bosnia and Herzegovina
13th century
Travnik, Bosnia and Herzegovina
1859
Kakanj, Bosnia and Herzegovina
14th century
Bijeljina, Bosnia and Herzegovina
14th century
Petrovo, Bosnia and Herzegovina
16th century
Šekovići, Bosnia and Herzegovina
1570
Kreševo, Bosnia and Herzegovina
1521
Teslić, Bosnia and Herzegovina
15th century
Šekovići, Bosnia and Herzegovina
16th century
Trebinje, Bosnia and Herzegovina
1694
Zavidovići, Bosnia and Herzegovina
13th 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.