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Loch Na Berie is the site of an Iron Age Broch and associated causeway. The site was excavated in the 1980s, which identified that the Broch had survived to first floor level. Loch na Berie is roughly 16.5 meters in diameter and the walls are roughly 3 meters thick. A modern causeway made of stones robbed from the broch was built to the west of the broch, though it is thought that an ancient causeway underlies the modern one.
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.