Successively a Roman municipium, the capital of the Visigothic Kingdom, a fortress of the Emirate of Cordoba, an outpost of the Christian kingdoms fighting the Moors and, in the 16th century, the temporary seat of supreme power under Charles V, Toledo is the repository of more than 2,000 years of history. Its masterpieces are the product of heterogeneous civilizations in an environment where the existence of three major religions – Judaism, Christianity and Islam – was a major factor.
Toledo is one of the Spanish cities with the greatest wealth of monuments. Toledo was declared a World Heritage Site by UNESCO in 1986 for its extensive monumental and cultural heritage.
References: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.