Sofia, Bulgaria
3rd century AD
Sofia, Bulgaria
3rd century AD
Varna, Bulgaria
2nd century AD
Silistra, Bulgaria
106 AD
Devnya, Bulgaria
3rd century AD
Veliko Tarnovo, Bulgaria
101-106 AD
Svishtov, Bulgaria
1st century AD
Razgrad, Bulgaria
1st century AD
Primorsko, Bulgaria
10th century BCE
Archar, Bulgaria
4th century BC
Kula, Bulgaria
3rd century AD
Mezdra, Bulgaria
3rd century AD
Belogradchik, Bulgaria
10000 - 8000 BCE
Pleven, Bulgaria
4th century AD
Veliki Preslav, Bulgaria
9th century AD
Targovishte, Bulgaria
7th century AD
Popovo, Bulgaria
308-324 AD
Silistra, Bulgaria
c. 350 AD
Belene, Bulgaria
1st century AD
Montana, Bulgaria
1st century AD
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.