San Giorgio Monferrato Castle originates from the 10th century and is well-preserved. The Monferrato family built massive walls in the 15th century. It was damaged by Spanish army in the early 1700s.
Built on five above-ground storeys, plus attic and tower for a total of about 4300 square metres of floor space and more than 5000 covered (the difference between the two measurements is given by the thickness of the ancient walls), the property also has an Italian-style garden, a small hanging garden, two majestic panoramic terraces with views sweeping from the plains to the Alpine arc, and a centuries-old park of about 3.6 hectares.
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.