Legnickie Pole, Poland
1723-1738
Brunary, Poland
18th century
Strzelin, Poland
11th century
Inowłódz, Poland
12th century
Lipnica Murowana, Poland
15th century
Braniewo, Poland
1565-1566
Strzelno, Poland
1133
Strzelno, Poland
1216
Wędrynia, Poland
1791
Jabłeczna, Poland
15th century
Zagórz, Poland
1730
Bartoszyce, Poland
14th century
Bieniszew, Poland
1747-1791
Strońsko, Poland
1235-1247
Pruszcz Gdański, Poland
14th century
Golub-Dobrzyń, Poland
1320–1350
Ostrzeszów, Poland
14th century
Prabuty, Poland
14th century
Gostynin, Poland
14th century
Gliwice, Poland
1232
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.