City walls of Nuremberg

The city walls of old city Nürnberg, in modern-day Nuremberg, are the defensive mechanism surrounding the city of Nuremberg, Germany. Construction started in the 12th Century and ended officially in the 16th Century, and they run for 5 kilometers (about 4 kilometers still standing) around the old town. The Nuremberg Castle together with the city wall is meant to be one of Europes most considerable medieval weir systems.

• http://en.wikipedia.org/wiki/City walls of Nuremberg