Where would you go? You can not interact or interfere with this period in time, you can simply observe. I would go back to the stories in the bible, just to see if they were true and what not. Maybe write a LEGIT bible and not one that's been revised and edited numerous times. I'd also consider the founding fathers of America. Check that shit out. But we've been around a long time. What would you visit? Ancient civilizations? "Atlantis?" Or would you just go back to something like the hippy age?