Saint Peter's church in Twijzel was built in 1692 out of brick and has a triple closed choir. The church is built against the medieval tower that dates from the 13th century. On top of the tower it is a gable roof witch was placed in 1787. The Pipe organ was built in 1905 by Bakker & Timmenga from Leeuwarden.
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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.