The UN has designated Jamuary 27th as Holocaust Rememberance Day. There are dozens of books on the holocaust and about those who witnessed and survived it. We must never forget. Here is some reading suggestions:
Henia Bryer: prisoner number A26188
A work of fiction but I included this novel because it's author has a fantastic survivor story of his own.
Thomas "Toivi" Blatt
Interview of Karl Frenzel by Thomas Blatt.
Holocaust by Bullets by Fr. Patrick Desbois