If you were a time traveler, what time period would you go to and why?

If I was a time traveler, I would go to prehistoric Europe, I would go to either the late middle period of the Stone Age or the early beginning of the end period of The Stone Age. I think it would be really cool if I got to see it cave-lion Mammoth or nanderthal, you know, all of the things that have died out since us Homo sapiens took over the planet.