Tarifa, Spain
Roman
Lugo, Spain
1st century AD
Bohonal de Ibor, Spain
2nd century AD
Las Médulas, Spain
0-100 AD
Ourense, Spain
c. 75 AD
Toledo, Spain
0-100 AD
Córdoba, Spain
3rd century AD
Algeciras, Spain
0-100 AD
Casas de Reina, Spain
1st century AD
Campoo de Enmedio, Spain
29 BCE - 19 BC
Bóveda de Mera, Spain
3rd century AD
Coria, Spain
1st century AD
Arellano, Spain
1st century AD
Villanueva del Río y Minas, Spain
1st century BCE
Ronda, Spain
45 BCE
Marbella, Spain
0-100 AD
Oliva de Plasencia, Spain
1st century AD
Chelva, Spain
1st century AD
Mérida, Spain
1st century AD
Eslava, 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.