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The Callanish II stone circle is one of many megalithic structures around the better-known (and larger) Callanish Stones (I) on the west coast of the isle of Lewis, in the Outer Hebrides, Scotland.
The stone circle consists of thin standing stones arranged in the shape of an ellipse measuring 21.6 by 18.9 metres. Five of the stones are standing and two have fallen. The stones vary from 2 to 3.3 metres in height. A slab, 1.4 metres, long lies in front of the western stone, pointing towards the centre of the circle. The stone circle surrounds a cairn with a diameter of 8.5 metres.
When one metre of peat was removed from the site in 1848, four holes were noticed, three grouped in an arc at the northwest, a fourth at the south-west. Wood charcoal found in them suggests that they formed an earlier timber circle about 10 metres in diameter.
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.