Granted, the blueprints for a Nazi death camp are "chilling" historical documents, but not as chilling for me as meeting some nice Jewish old lady (a dying breed, but of which there are still many) greeting me with a big smile outside her apartment building in Washington Heigths. I've met and befriended several of these women who have yet to be displaced by the changing tide of Dominicans (nice people, too, and with their own good food and music).
When these widows stretch out their arthritic right hand to be nice, say "Nu, so how's by you?" and exchange old world civil pleasantries you suddenly notice a series of numbers tattooed in black ink on the inside of their wrist. For me, that is chilling documentation. It's also life-affirming. But although their numbers are diminishing, one could do worse than befriend an immigrant to the USA from war torn Europe who is a death camp survivor. No need to have them rehash their ordeals in concentration camps. Just listen to what they have to say about life and their general, positive world view. Maybe con them into sharing their secret recipe for kreplach? Regardless, make nice and learn. They have a lot to impart.
My point? Why let a few blue prints chill you when you can still meet real survivors of the holocaust and learn from them? Earn your schmaltz and wear it on your sleeve so others won't forget.