Levan Castle is a fortified tower house in Levan area of Gourock, Inverclyde. A building had been on the site from the 14th century, but the present structure was substantially enlarged after 1547 and formed part of the Ardgowan Estates. In the 19th century a large mansion was built within a few metres of the ruined castle and was given the same name. The original castle was renovated in the 1980s. The castle has undergone further renovations in 2016 under its new owner, Kim Munro, who runs it as a bed & breakfast.
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.