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Kilcashel Stone Fort is a double court cairn and National Monument located in County Mayo, Ireland, 800m southeast of Kilmovee. The last surviving member of three stone forts in the area, it's estimated to have been constructed between 2,500 and 500BC.
Kilcashel Stone Fort is 30 m in diameter; the stone wall is 5m thick and 3m in height. A souterrain is located inside, as well as a bullaun and the sites of two collapsed houses.
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.