A rose is placed on a sign depicting a skull and reading "Stop" in front of the gate of the former Nazi concentration camp Auschwitz-Birkenau in Oswiecim, Poland, on Holocaust Day, January 27, 2013. A ceremony took place at the site 68 years after the liberation of the death camp by Soviet troops, in rememberance of the victims of the Holocaust. AFP PHOTO / JANEK SKARZYNSKI