I've written before about Berlin's Custom's Wall (Zollmauer), so the theme of walls is not an unfamiliar one here. Today I wanted to show a few photos of the last remaining section of Berlin's Medieval City Wall. The Wall was first constructed around 1250, and was only around 6 feet high. It was built because the relatively new city (the first permanent settlement began sometime in the late 1100s) needed a way to defend itself. There aren't any hills in the area on which to build a fortress, so the best that the people at the time could do was throw together whatever stones and bricks they could find.
The Medeival City Wall initially contained both of the medieval towns that eventually fused to become Berlin - Berlin and Cölln. It was continually strengthened over the next couple of hundred years.
Eventually the Medieval City Wall stood 5 meters high, with two moats separated by a raised mound of earth covered with brambles. Towers and gates along the wall stood up to 25 meters tall.
Eventually the city began to push up against the city, and buildings started to be used as replacement sections of wall. In the section of Linnenstraße, you can see how the wall was simply used as one of the walls for a building.
By the 17th century, much of the medieval wall had disappeared into the urban fabric. It's defensive capabilities had also eroded over time, and were eventually replaced by new fortification walls beginning in the mid-1600s. Nothing remains of this "newer" wall.