In our series on the Berlin Wall, this time we meet Axel Klausmeier, director of the Berlin Wall Foundation (Stiftung Berliner Mauer) who has documented the remains of the Iron Curtain in Berlin. For example, he knows where parts of the Berlin Wall and Guard Towers still exist. He's now published a book it. We check out remnants of the wall also along Bernauer Street, and at Invaliden Cemetary.