The spectacular Kallio church, designed by Lars Sonck and built in 1908–1912, represents the Finnish national romantic school of architecture, as well as a change to Art Nouveau. The bells of the tower play a melody composed by Jean Sibelius. Inside the church are numerous interesting details such as a crucifix and relief made by sculptor Hannes Autere.
In the beginning of independent Finland Tolstoyan movement took the church as their base and proclaimed pacifism there. During World War II the church tower was one of Helsinki's air control points. In good weather, you can see Estonia from the tower.
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.