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

Mine has always been Medieval and old west..
But I really do like learning all history. My wife always gives me a hard time about watching the history channel so much.
When I was in school, basically the only way to learn history other than in class, was to break out the encyclopedia.. Now, if I have a random thought, I Google it.. If I'm unsure about something I having a discussion about, I don't hesitate to Google it..