When was the Berlin Wall open?

The Berlin Wall was never officially open. It was a guarded concrete barrier that divided Berlin from 1961 to 1989, completely cutting off (by land) West Berlin from surrounding East Germany and from East Berlin. The barrier included guard towers placed along large sections of the wall, as well as a wide area (later known as the "death strip") that contained anti-tank obstacles, mines, and other defenses. The death strip was patrolled by armed guards who were ordered to shoot anyone who tried to cross the wall. The Berlin Wall was finally breached by protesters on November 9, 1989, and was eventually demolished in 1990.