To me, it is remarkable how many things we think utterly unthinkable today are actually quite recent, very much in living history.
Western Europe had an officially fascist government 50 years (+1 day) ago. ~60 years ago Black people in the US were officially discriminated, enshrined in law. Franco-Algerian wars also finished 62 years ago, and saw atrocities worthy of the worst ethnic cleansing of WWII. Balkan wars are still more recent and depressingly deadly too. Alan Turing committed suicide 70 years ago, being pursued after the "crime" of homosexuality. Not to mention some of the stuff going on today...
We take so much for granted, the world really is a nicer place than it used to be.