Auschwitz
Us non-Jews may think we know all there is to know about the Holocaust, but we only know it intellectually. I recently attended https://theauschwitzexhibition.com/#about, and I’ve still not recovered from it. I’m not sure I ever will.
It was a combination of the artifacts from the camp - especially a brick from one of the gas chambers - that affected me so viscerally. The exhibition’s a/v historical presentations were interesting and useful, but on a much different (ntellectual) level
I remember once telling a Jewish friend of mine how useful ancestry.com had been for me in understanding my heritage, and my friend responded that it has been difficult and painful - sometimes impossible - for her to use that app.
Now I know why.