The significant architectural structure built to symbolize unity in Berlin is the Berlin Wall, which stood from 1961 to 1989. Although originally constructed to prevent East Germans from fleeing to the West, it later became a powerful symbol of division during the Cold War. Its fall in November 1989 marked the end of an era, symbolizing the collapse of communist power in Eastern Europe and heralding the reunification of Germany. In its aftermath, remnants of the wall have been preserved as monuments, serving as reminders of the struggle for freedom and the importance of unity across divided societies.