The Church of St. Olaf in Sysmä was built during the first two decades of 16th century. First records of the church in Sysmä date back to the year 1398. There may have been two churches before the present one.
The north and south walls were dismantled in 1832-1835 when the church was converted into cruciform plan according to design by C.L. Engel. The belfry was built in 1845.
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.