That was rather amazing to me, because I am a long-time scholar of this part of history because of personal inclinations and family history.
If you saw this perspective, you were already inside the death camp portion of Auschwitz - Birkenau. The tracks are cleaned up now to the more traditionally shown single track leading to the landing ramp (not built until late in the war). But in the old photos, there were several merging train tracks that met at the ramp, then separated out again.
I am always amazed by the clinical distance that people took while engineering and documenting the most amazing atrocities. One thing that nailed me to the core was a scene where some metal address/name tags were taken from a drawer. These were factory "slave" laborers. This particular person was 17 years of age when she was there, and her birthdate was my birthdate - 26 years before I was born, but my own birthdate. It was freaky.
Arbeit macht frei - Work will make you free. In a macabre way of thinking, that was true, because the fatality rate of the slave laborers was also very high. And don't lose sight of the fact that the Jews, although the largest proportion of victims, were only a portion. The persecution extended to homosexuals and Gypsies as well as smaller ethnic groups and some of the conquered territory's inhabitants. The killing machine of WWII extended far and wide.
If you want to read a bit more about the show, the NY Times had a great review here. Take a read, and if it gets rebroadcast, take a look. It is well done with new information and pictures, and was quite comprehensive without being maudlin. Probably the best thing I've seen on the Holocaust in many years, perhaps since Shoah so many years ago. Remember your ancestors on this cold and blustery Minnesota day. Remember them and honor them - they are a part of you.