Buchanan Castle is a ruined country house in Stirlingshire. The house was commissioned by James Graham, 4th Duke of Montrose and built in 1852-1858 as a home for the Montrose family, serving as such until 1925. It was built as a replacement for Buchanan Auld House, which is located 0.8 km to the northwest but was destroyed in a fire in 1852. The old house and surrounding lands had been the property of the Clan Buchanan but passed to the Clan Graham in the late 17th century. The roof of the building was removed in 1954 and the condition of the house has since deteriorated, but it remains the seat of the Clan Graham.
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.