Mérida, Spain
1st century AD
Orbaizeta, France
1st century BCE
Baena, Spain
1st century BCE
Portmán, Spain
1st century BCE
San Roque, Spain
940 BCE
Logroño, Spain
2nd century AD
Mendigorría, Spain
1st century BCE
Córdoba, Spain
3000-2000 BCE
Santacara, Spain
1st century BCE
Marbella, Spain
2nd century AD
Las Cuevas de Soria, Spain
4th century AD
Casares, Spain
2nd century BCE
Nules, Spain
1st century BCE
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.