I love photography too, and I enjoy putting photos in different orders in albums. I like to organize them by dominant color, or the person in them, or the setting, etc. - it's one of those things that relaxes me. But actually what I especially love doing is putting them together in collages. Collage is my favorite art form, I think.
I also love history. I am a history (and English lit) major at university right now. So your interest in historical photographs is intriguing - I never put those two things together before, but of course that's a great idea.
Time travel - that would be fun, lol. Actually I have always wondered about that, and the idea that if you travel back in time, would your existence in that time period change history, maybe even to the point of you no longer existing? Okay, I'm not sure if that makes sense...