An interesting fact for you as you walk: this specific section of the wall was actually part of what was called the hinterland wall. While the outer wall facing West Berlin was famous for its graffiti during the Cold War, this side was almost always kept a sterile, blank gray because it faced into East Berlin. Just months after the borders opened in November 1989, artists David Monty and Heike Stephan proposed turning this grim concrete into the world's largest open-air gallery. Between March and September 1990, a hundred and eighteen international artists converged here to paint their hopes and critiques. This site was officially opened on September twenty-eighth, 1990, just days before the formal reunification of Germany. It is a rare example of a wall being preserved not to keep people out, but to ensure that the memory of its fall is never forgotten.