Checkpoint Charlie, which was one of the border crossings in East Berlin and West Berlin, which was used by foreign diplomats and foreigners, you were allowed to go to East Berlin. But if you were an East Berliner, you're pretty much not allowed to go to West Berlin. What he is trying to do is stop this brain drain, basically stop the smart people from leaving East Germany, their most natural resource. Is a smart person a natural resource? So the wall, how about that wall? The wall in its completion, it went through four different generations, is going to be over 97 miles long, 27 miles dividing the actual city itself between East Berlin and West Berlin. We're talking about 45,000 sections of reinforced concrete, 12 feet high, 4 feet wide, and all topped off with a kind of a smooth ring around the top so you couldn't grasp your little fingers up there and climb up the wall.