Honestly, I'd have to say WWII. My fangirling over Winston Churchill and that obsession I had with Nazi Germany a few years that I never quite got over, all of my interesting relatives were doing the interesting things that made them interesting during that time. Interesting things which I only found out about after they'd died, and I couldn't pester them about it. I mean, seriously, my Grandpa was in the Manhatten Project? All that time he spent quizzing me on the periodic table of elements while I complained that I liked history much better than maths and science and he couldn't have mentioned this once?