Hume Castle is the heavily modified remnants of a late 12th- or early 13th-century castle of enceinte held by the powerful Hume or Home family, Wardens of the Eastern March who became successively the Lords Home and the Earls of Home.
Standing as it does, on an impressive height above its eponymous castleton, it commands fine prospects across the Merse, with views to the English border at Carter Bar. It had historically been used as a beacon to warn of invasion. Its enormous walls were created in the 18th century but remnants of the central keep and other features can still be seen.
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.