Porta Siberia is a massive gate, dating back to 1551-53. It was the work of Galeazzo Alessi and once formed part of the 16th-century walls. Its name derives from 'cibaria' (foodstuffs), for it was through this gate that the city's produce passed, both on arrival from the sea and departure towards other ports in the Mediterranean.Once used as a customs area, after the Old Port was restructured it was turned into a museum devoted to the painter and set designer Emanuele Luzzati, housing temporary exhibitions by the Genoese artist and by leading contemporary illustrators.
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.