I use this while we are reading the novel NIGHT, but it could be used with any similar historical fiction book about the holocaust or social studies class.
PBS offers a great website with an interactive map of Auschwitz. I is called Auschwitz: Inside the Nazi State. The kids find this SOOO interesting, plus they get to use the computers. It is perfect because they can access it from home too.
I am posting a printable worksheet to guide them through the site with questions to answer along the way. It helps a lot with discussion of the site as well.