The Church of San Sebastiano dates from the 16th century and is located in Piazza Garibaldi, in front of the Cathedral. It was built as a tribute to said Saint by the people in gratitude for deliverance from the plague. In 1711 it was altered along its whole length to make space for the Piazza Garibaldi. As a result, a new façade was designed by Pasquale Saetta in the late 19th century. It is embellished with columns employing all three classical architectural orders: Doric bases, Ionicin central sections and Corinthian crowns. There are also niches containing statues of the sculptor Francesco Biangardi, who worked in Caltanissetta during the late 19th century. The centre sculptures represent the saints Peter and Paul; the upper band shows San Sebastian pierced with arrows, being created in memory of his martyrdom.
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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.