There's a reason why the Auschwitz that exists today is just a replica. The original was destroyed post-war. Yes, bodies were incinerated but mainly because the typhus deaths were so great they couldn't bury bodies quickly enough.

Look, I'm not defending the motives of the Nazi party, but it's strange that the original number of dead was somewhere around 800K but has grown to six million since WW2. There weren't even two million Jews in Europe during WW2. The winners get to write the history books.