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In this Dec. 7, 2019, photo, railway tracks from where where hundreds of thousands of people were directed to the gas chambers directed to the gas chambers to be murdered, inside the former Nazi death camp of Auschwitz Birkenau or Auschwitz II, in Oswiecim, Poland. World leaders will gather twice to mark the 75th anniversary of the liberation of the Auschwitz-Birkenau concentration camp _ once on Thursday, Jan. 23, 2020, in Jerusalem and again on Jan. 27 at the Auschwitz site in southern Poland. The fact that there will be two competing ceremonies reflects how politically charged World War II remains for nationalist governments in Russia and Poland. (AP Photo/Markus Schreiber, File)