Seen through the windows of a guard booth, visitors walk at the Auschwitz Nazi death camp in Oswiecim, Poland, Monday, Jan. 26, 2015. A decade ago, 1,500 Holocaust survivors traveled to Auschwitz to mark the 60th anniversary of the death camp's liberation. On Tuesday, for the 70th anniversary, organizers are expecting 300, the youngest in their 70s. (AP Photo/Alik Keplicz), APTOPIX