The Srebrenica Genocide Memorial was built to commemorate the Srebrenica massacre, committed in July 1995 by Serbs against Bosniak Muslims during the war in Bosnia-Herzegovina. The site today is basically a cemetery, where some 6000 victims of the atrocities are buried, and continue to be buried once identified which is an ongoing process. In addition there is a kind of museum in the nearby former car battery factory, where many of the victims had tried to seek refuge. Srebrenica stands for the worst genocidal atrocities committed in Europe since the Holocaust.
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.