Berlin, the capital city of the Federal Republic of Germany, was first mentioned in the 13th century. It has been the capital of the Kingdom of Prussia, the German Empire, the Weimar Republic and the Third Reich, but was divided after World War II. East Berlin became the capital of the German Democratic Republic while West Berlin remained a part West Germany surrounded by the Berlin Wall. This lasted from 1961 until 9 november 1989, when the Berlin wall came down, and the communist regime was ousted. A year later Germany was reunited and Berlin became once again the nation’s capital.