Why was Auschwitz not destroyed by the Nazis to hide evidence, but camps like Treblinka and Westerbork were?

Question

Why was Auschwitz not destroyed by the Nazis to hide evidence, but camps like Treblinka and Westerbork were?

In: 151

Answer 1

It was, to an extent. The Nazis demolished the gas chambers and crematoria, as well as putting all prisoners on a forced march to camps further from the front.