The greatest documentary ever made

What is the greatest documentary ever made? You could make an argument for any one of several films made by Errol Morris or Werner Herzog.  Or, if you privilege box office success and political impact, there are multiple titles to consider from Michael Moore.

Does a work from a somewhat earlier era merit the top spot, because of its intrinsic merit and its impact on shaping the development of documentary storytelling? In that case, "Harlan County USA" or "Don't Look Back" might be your top pick.

Below are 10 films I consider worthy of consideration (weighted to films in English, it must be admitted). But you'll notice there is a button on the bottom for write-in candidates!

The polls are open!