The University of Copenhagen Botanical Garden (Botanisk have) covers an area of 10 hectares and is particularly noted for its extensive complex of historical glasshouses dating from 1874. The garden is part of the Natural History Museum of Denmark, which is itself part of the University of Copenhagen Faculty of Science. It serves both research, educational and recreational purposes. The botanical garden was first established in 1600 but it was moved twice before it was ultimately given its current location in 1870. It was probably founded to secure a collection of Danish medicinal plants after the Reformation had seen many convents and their gardens abandoned or demolished.
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.