Nitra, Slovakia
1624-1630
Tvrdošín, Slovakia
15th century
Jasov, Slovakia
1170/1766
Nitra, Slovakia
11th century
Bodružal, Slovakia
1658
Ladomirová, Slovakia
1742
Leštiny, Slovakia
1688
Kopčany, Slovakia
9-10th century AD
Ruská Bystrá, Slovakia
1720-1730
Tvrdošín, Slovakia
1766
Kostoľany pod Tribečom, Slovakia
c. 1000 AD
Nitra, Slovakia
12th century
Trenčín, Slovakia
1224
Samorín, Slovakia
13th century
Levice, Slovakia
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.