St. Andreas' Church (Grote of Andreaskerk) was originally built in 1225. The tower is the only part remaining of this church. The current church was built in the early 15th century. The Gothic nave was completed around 1425. The church has been restored and enlarged later. The pulpit was made in 1635. The font from the 13th century dates from the first church.
References:There´s a beautiful painting by Adrianus Eversen (1818-1897) of St. Andreas Church
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.