German Chancellor Angela Merkel and U.S. Ambassador to Germany William Timken take a walk at the roof terrace of the new U.S. Embassy in Berlin July 4, 2008. The buildings in the background are the "Quadriga" atop the Brandenburger Tor gate (R), and the Reichstag which is the seat of the German lower house of parliament "Bundestag". Picture taken July 4, 2008. REUTERS/Bundespresseamt/Guido Bergmann/Pool (GERMANY)