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Borgarfjörð, the 'fjord of the borg', now West Burra Firt, was so named by the Norsemen on account of the borg (broch) or 'Pictish tower', which still stands on the little holm north of West Burra Firth pier, now greatly ruined. The broch dates to the very early 1st century AD and in the 19th century was 'connected with the land by a bridge of large stepping-stones over which the sea flows at full tide.' The diameter is 18 m and the walls are an average of 4.6 m thick. The stone still stands eight or nine courses high in places.
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.