The former Protestant church of Eastermar was demolished in 1868. Today only the medieval tower from the 13th century remains. The church is surrounded by a graveyard. Next to the tower stands a grave diggers building. The mechanical clockwork in the tower was made by the Gebr. van Bergen from Midwolda, Groningen in 1924.
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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.