Ljubljana, Slovenia
1646-1660
Ljubljana, Slovenia
1701-1707
Piran, Slovenia
c. 1404
Piran, Slovenia
1439
Piran, Slovenia
15th century
Piran, Slovenia
1344
Piran, Slovenia
1270
Bled, Slovenia
17th century
Ljubljana, Slovenia
1613-1615
Piran, Slovenia
1773
Ljubljana, Slovenia
1718-1726
Ljubljana, Slovenia
1672-1696
Koper, Slovenia
12th century
Bled, Slovenia
1905
Maribor, Slovenia
1248
Maribor, Slovenia
1892-1900
Črni Kal, Slovenia
12th century
Celje, Slovenia
1306
Zasip, Slovenia
1400
Novo mesto, Slovenia
1493
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.