Guillaume, Hereditary Grand Duke of Luxembourg (C), his wife Countess Stephanie de Lannoy (2nd L, hidden), Luxemburg's Prime Minister Xavier Bettel (L) and Piotr Cywinski (4th L), director of the Auschwitz-Birkenau museum, look on as a plaque for the Luxembourgian vicitims who died in the Nazi concentration camp in Auschwitz is being unveiled at the Auschwitz-Birkenau memorial site on January 27, 2015 in Oswiecim, Poland. Seventy years after the liberation of Auschwitz, ageing survivors and dignitaries gather at the site synonymous with the Holocaust to honour victims and sound the alarm over a fresh wave of anti-Semitism. AFP PHOTO / ALAIN JOCARD