I see your September 11, 1973 and raise you the actual first 9/11, the fall of Barcelona in 1713 - https://news.ycombinator.com/item?id=41510919 https://news.yc

I see your September 11, 1973 and raise you the actual first 9/11, the fall of Barcelona in 1713 - https://news.ycombinator.com/item?id=41510919 https://news.ycombinator.com/item?id=41510919 ( tongue in cheek, no event is more important than another of course ) Remembered on this very day as "La Diada" in Catalunya.