Tisha B'av is essentially Holocaust Remembrance Day as well.
As part of the "younger generation" (my parents and grandparents were for the most part born after the Holocaust) I didn't grow up hearing personal accounts of survivors, so its even more important for me to attempt to internalize this tragedy for myself and my children.
Last Tisha B'av I came across this compilation of actual footage of the horrors that happened. אינו דומה שמיעה לראייה, it was literally life altering for me.
So I'm sharing it here, it's not for the faint of heart. Or perhaps it is.
Because we must never forget.
זכור ד׳ מה היה לנו
יפקדם אלקים בארצות החיים ועדי עד זכרם לברכה
https://collections.ushmm.org/search/catalog/irn1000182 War Department Information Film showing German concentration camps and victims of Auschwitz, Majdanek, Treblinka, Belsen, Buchenwald, and other camps. Originally made with a German soundtrack for screening in occupied Germany and Austria, this film was the first documentary to show what the Allies found when they liberated the Nazi camps: the survivors, the conditions, and the evidence of mass murder. The film includes accounts of the economic aspects of the camps' operation, the interrogation of captured camp personnel, and the enforced visits of the inhabitants of neighboring towns, who, along with the rest of their compatriots, are blamed for complicity in the Nazi crimes.