Ballochroy is a megalithic site in Kintyre on the Argyll peninsula. It consists of three vertical stones, side by side, aligned with various land features 11–31 km away.
Alexander Thom, known for his work on Stonehenge, maintained that the great length between the stones and the features of distant landscape lent precision to pinpointing the midsummer and winter solstices for ancient observers.
These three stones are considered the most spectacular set of megalithic monuments that cluster around south Argyll. It is possible that this last, smallest, stone may have been broken off at the top. The line of stones is orientated north-east to south-west.
As with many megalithic sites, the current theories concerning the exact use of the stones at Ballochroy are somewhat controversial.
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.