TO MATCH FEATURE GERMANY WAR - A man climbs up a wall of former Nazi air defence towers in Berlin's Humboldthain park in this picture taken July 5, 2004. Since April regular guided tours have taken curious visitors into the vast World War Two structure to see the turret interiors and the debris that resulted from two failed attemps to blow the 40 metre-high and 70 metre-wide fortress up after the war. REUTERS/Arnd Wiegmann AKW/JV