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Dun Hallin is an Iron Age broch located on the Waternish peninsula of Skye. Dun Hallin has an external diameter of around 17.4 metres and an internal diameter of around 10.5 metres. The broch walls currently stand to a maximum height of 3.8 metres on the north and west sides. The entrance is on the southeast side but is in a ruined state. On each side of the entrance passage are oval guard cells, although only the northern, right-hand cell can easily be seen. The interior of the broch is full of rubble, much of it grassed over. A mural gallery is visible on the southwest side and a lintel stone remains in position over the doorway there. Six steps of the intra-mural stairway were found when the broch was examined in 1921 but are not now apparent. The broch is additionally defended by an outer stone wall which runs round the edge of the rocky knoll and which is still about 6 metres high to the south. The broch has not been excavated.
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.