The Jerez Cathedral is a beautiful building from the 17th century which combines Gothic, Baroque and Neoclassical styles and stands above the earlier Great Mosque of Jerez and the old Church of El Salvador.
The chapels of La Inmaculada, El Sagrario and Las Ánimas stand out inside, the latter dedicated to the famous Cristo de la Viga, from the 14th century.
The bell tower, which is outside, was possibly built over the minaret of the old mosque of Jerez de la Frontera.
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.