Barbed wire fences surround detention buildings at the Birkenau 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/Czarek Sokolowski)
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