Zehlendorf is the southwestern-most district in Berlin. When American forces occupied Berlin, and later were stationed in Berlin during the Cold War, Zehlendorf was the area where most of those forces were centered. An American Consulate is still located in Zehlendorf. Zehlendorf contains some of the most wonderful natural settings in Berlin, including the Schlachtensee and Nikolassee. Additionally, it has many wonderful residential neighborhoods, some with cobblestone streets and buildings that are over 100 years old. There is easy access to the middle of Berlin via road and S-Bahn. The S1 line makes 3 stops in Zehlendorf and runs right through Unter den Linden, where the Brandenburg Gate is located. As of 2001 Zehlendorf was merged with Steglitz to form the new borough of Steglitz-Zehlendorf.