To be honest, most of the documentaries we watched this year didn’t hold the interest of my 1st grader (although my 10 yo learned a lot). However he did enjoy “The Story of One” which tracks the history of the number 1 through time and cultures. It is funny and has a lot of info. We watched it toward the end of the year (just recently) so he was familiar with many of the ancient cultures/places discussed.
It is only available on DVD from netflix (which is how I got it) but I see that it is on google video here
I’d like to see recommendations from others as well. Netflix should be ashamed of their search function – it is the worst ever. I always feel like what I want is there, I just can’t find it!