Although this documentary isn't a long one (being the first episode in a short series by ARTE), it's really great. Shares many interesting facts about the origin of Alice's Adventures in Wonderland - mostly about its manuscript, from the times when it was initially called Alice's Adventures Under Ground. Features very professional Carrollian scholars and enthusiasts like Franziska Kohlt, Edward Wakeling or Mark Davies. It also explains very well certain false ideas about Lewis Carroll, which are sadly present in various places (in press, online etc.). A great history documentary - recommending it for everyone, not only for the lovers of Carroll's works. I hope this will be a very good discovery for all interested in the history of literature.
