What is your favorite part of history to read/learn about?

War things. WW2 eastern front in particular.

But my favorite subject is the American Mafia, specifically the 70's to early 80's when things started to fall apart for them. I just find it insanely fascinating.

I also go crazy on google earth. Especially now that it lets you go back in time on the maps. It's great to see how things change over time.