The Basilica of Vera Cruz consists of two clearly differentiated parts: the walls and the sanctuary. Despite its Islamic origins, the monument has undergone many changes. Nowadays, 14 different shaped-and-sized fortified towers are spread along the wall. The fortress belonged first to the Order of the Temple, and later to the Order of Santiago, a Spanish Christian military order. Moreover, the castle was used for military purposes during the Spanish Succession War and the Peninsular War.
The Holy True Cross Sanctuary was built in the heart of the old fortress in the 17th century. Then, in the 18th century, its magnificent baroque façade was annexed to the sanctuary. The church has a Latin-Cross plan, a continuous gallery over the lateral naves, and also a dome over the transept. Recently, the Holy True Cross Museum has been reopened in the sanctuary rooms.
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.