The DDR Museum is an interactive museum located in the former governmental district of East Germany, right on the river Spree. Its exhibition shows the daily life in East Germany (known in German as the Deutsche Demokratische Republik or DDR) in a direct 'hands-on' way. For example, a covert listening device gives visitors the sense of being 'under surveillance'.
The museum was opened on July 15, 2006, as a private museum. The private funding is unusual in Germany, because German museums are normally funded by the state. The museum met some opposition from state-owned museums, who considered possibly 'suspect' a private museum and concerned that the museum could be used as an argument to question public funding to museums in general.
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.