Members of the &quot;Israeli Guide Dog Center for the Blind&quot; participate in the annual &quot;March of the Living&quot; at Auschwitz-Birkenau concentration camp, April 8, 2013 to commemorate the victims of the Holocaust . The Nazi-hunting Simon Wiesenthal Center hung posters on the streets of major German cities Tuesday seeking information on the last perpetrators of the Holocaust still at large nearly 70yrs on.