The castle of Toolse was built in 1471 by the Livonian Order as defence against pirates sailing in the Gulf of Finland. During the Livonian War it changed hands several times, was apparently destroyed and later rebuilt. In 1581 French mercenary Pontus de la Gardie captured the castle for Sweden from Russia which had held it since 1558. The castle was destroyed again during the Great Northern War, ever since which it has laid in its current state of ruin.
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.