The Church of Our Lady (Vor Frue Kirke) is the cathedral of Copenhagen and the National Cathedral of Denmark. The present day version of the church was designed by the architect Christian Frederik Hansen in the neoclassical style and was completed in 1829.
There has been several several churches on this site since 1209. The cathedral has been rebuilt four times: The first church was burnt down and reconstructed in 1316. The second church was razed by a great fire in 1728 together with five other churches in Copenhagen and rebuilt in 1738. Finally during the bombardment of Copenhagen in 1807 the spire was hit by a Congreve rocket and nearly burnt the church down to the ground.
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.