Plaza de la Corredera is the result of the works carried out between 1683 and 1687 by Chief Magistrate Francisco Ronquillo Briceño. These were motivated by the almost collapse of one of the wooden stalls that were back then installed for the bullfightings held in the square which made the audience panic.
This grand 17th-century square has an elaborate history as a site of public spectacles, including bullfights and Inquisition burnings. Nowadays it's ringed by balconied apartments and is home to an assortment of popular, though culinarily run-of-the-mill, cafes and restaurants. The Mercado de la Corredera is a busy morning food market selling all kinds of fresh produce.
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.