Børkop, Denmark
12th century
Kolding, Denmark
12th century
Fredericia, Denmark
13th century
Slangerup, Denmark
c. 1085
Præstø, Denmark
12th century
Nibe, Denmark
c. 1250
Borre, Denmark
13th century
Grindsted, Denmark
12th century
Nørreballe, Denmark
14th century
Nordborg, Denmark
12th century
Nordborg, Denmark
c. 1100
Rønne, Denmark
ca. 1150
Roskilde, Denmark
c. 1100
Hasle, Denmark
13th century
Rudkobing, Denmark
12th century
Holeby, Denmark
c. 1250
Errindlev, Denmark
13th century
Harpelunde, Denmark
c. 1250
Fredericia, Denmark
12th century
Børkop, Denmark
12th 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.