These aren't strictly about the Holocaust, but anyone interested in that time period would enjoy these.
Downfall (2004)
Not necessarily about the Holocaust, but an excellent movie nonetheless. It's about Hitlers last days before he offs himself. The most famous scene in the film (When Hitler learns that he will definitely lose the war and that his generals are starting to turn on him) was the one that started the whole "Hitler finds out about..." meme that was big a few years ago. It's still on Netflix.
^The real version, that has been parodied thousands of times.
Mr. Death: The Rise and Fall of Fred A. Leuchter, Jr. (1999)
A documentary about a guy that was an expert on prison executions (And built some of them) who eventually became one of the leading researchers in Holocaust denial. Very interesting individual. As much as my description screams "Pure cac"...you don't really get the sense that he started out as this big racist white nationalist type (In fact, a lot of his work with prisons focused on making executions more humane). He ends up getting contacted by the defense attorneys of a Holocaust denier, goes over to Auschwitz and studies the remains of the buildings. Now look, his testing is way off, methods are unscientific, and there is video-evidence showing his incompetence...but at the end of the day, dude doesn't find evidence of people being gassed at Auschwitz....
This ends up ruining his career, family, reputation...everything. In the end, dude just had too much pride to admit that his testing was wrong and that he didn't know what he was doing.
Unfortunately, it's not on netflix streaming anymore....
fakkits took it down.