Ventlinge Church, dedicated to St. Lawrence, was built during the first half of the 1100's. It began as a towerless vestibule church of Romanesque style. Around the year 1200, a defensive tower entirely on its own grounds was added. Above the staircase entrance in the porch is a throw shaft straight up through the wall. Church defenders could also stand on the tower’s second floor and throw stones at unwelcome visitors. In 1812, the church was repaired and rebuilt so its medieval character was lost. The lantern was added to the tower in 1825.
References: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.