Berlin's "Ringbahn" (circle railway) is a circular public train route that surrounds Berlin's inner city area. It helps to connect the vast network of subway and above ground train lines that criss-cross the city, making transfers from one part of the city to the other much quick. However, beyond being a helpful public transit feature, it also acts as a dividing line for two different versions of Berlin. This week we talk about Berlin's Ringbahn and the differences between the architecture, people, and lifestyle on either side of the "ring."