Mystras, Greece
14th century
Argos-Mykines, Greece
1300-1250 BCE
Kalabaka, Greece
15th century
Mystras, Greece
1290-1295
Mystras, Greece
1280-1292
Thessaloniki, Greece
14th century
Kalabaka, Greece
c. 1400
Mystras, Greece
1428
Oichalia, Greece
450-400 BCE
Argos-Mykines, Greece
1400-1200 BCE
Thessaloniki, Greece
450-470 AD
Mystras, Greece
1308-1322
Thessaloniki, Greece
14th century
Kalabaka, Greece
1510
Thessaloniki, Greece
5th century AD
Thessaloniki, Greece
1310-1320
Mystras, Greece
1249
Mount Athos, Greece
13th century
Thessaloniki, Greece
12th century
Mount Athos, Greece
1198
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.