Molde, Norway
c. 1200
Inderøy, Norway
c. 1150
Frosta, Norway
16th century
Levanger, Norway
c. 1180
Gloppen, Norway
12th century
Balestrand, Norway
c. 1300
Sørum, Norway
1166
Lillesand, Norway
1150
Tvedestrand, Norway
12th century
Hole, Norway
13th century
Kongsberg, Norway
1184
Modum, Norway
13th century
Kinn, Norway
12th century
Ænes, Norway
1190-1220
Østre Toten, Norway
1170
Porsgrunn, Norway
1150/1787
Sauherad, Norway
12th century
Siljan, Norway
1150-1200
Lunner, Norway
12th century
Nord-Aurdal, Norway
c. 1265
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.