Final answer:
Hitler ordered the destruction of concentration camps to hide evidence of the Holocaust, particularly as Allied forces advanced and discovered the atrocities perpetrated in places like Auschwitz.
Step-by-step explanation:
Hitler ordered all concentration camps to be destroyed as an attempt to hide evidence of the mass killing of Jews. This was part of a larger effort by the Nazis to cover up the atrocities of the Holocaust as Allied forces began to liberate the camps and the extent of the genocide became apparent. The concentration camps, including Auschwitz, were places of unspeakable horror where millions of Jews and other victims were imprisoned, forced into labor, and systematically exterminated. As the war drew to a close, the Nazis tried to dismantle these camps to prevent the full scale of their crimes from being exposed.