Kiviloo was founded as an Episcopal castle in 1413. The few ruins of the Episcopal castle (destroyed in the Livonian War in 1558) can be seen even at present. The current eclectic manor house (in private possession) was built during the ownership period of the von Stackelbergs in about 1906-1910 (the earlier wooden structure was burnt down in 1905).
Reference: Estonian Manors
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.