The Hortus Botanicus Lovaniensis is the oldest botanical garden of Belgium, dating from 1738. The botanical garden has always been linked with the Katholieke Universiteit Leuven. It first aim was to provide herbs for medical use. Later, the gardens became used for study purposes and they hosted an extensive collection of ornamental plants, cultivated plants that could possibly be used for economic purposes and rare plants. Despite the differentiating in use, in popular language the garden is still called the Dutch equivalent for 'herbgarden' (Kruidtuin).
Nowadays the Botanical Garden is maintained by the municipality of Leuven. In contrast with many other botanical gardens, this garden has free access and is used extensively by tourists and citizens alike. The garden functions sometimes as a place of exhibition for contemporary art.
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.