Les Clées, Switzerland
11th century
Bardonnex, Switzerland
15th century
Regensdorf, Switzerland
11th century
Muttenz, Switzerland
10th century
Sils im Domleschg, Switzerland
11th century
Riggisberg, Switzerland
1700
Schlosswil, Switzerland
12th century
Lauerz, Switzerland
12th century
Gorgier, Switzerland
13th century
Ettiswil, Switzerland
c. 1304
Valangin, Switzerland
12th century
Oftringen, Switzerland
c. 1200
Bondo, Switzerland
c. 1200
Amsoldingen, Switzerland
10th century AD
Thun, Switzerland
13th century
Kyburg-Buchegg, Switzerland
1546
Rossens, Switzerland
12th century
Böttstein, Switzerland
12th century
Sils im Domleschg, Switzerland
13th century
Trachselwald, Switzerland
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.