One thing which I tried to do with my kids, after exhausting all the classics (Narnia, _The Hobbit_, _The Lord of the Rings_, Susan Cooper's _The Dark is Rising Pentalogy_ --- highly recommend the latter for folks who have not read it) was to read biographies in chronological order --- as a dry run I did American Presidents (which did great things for my understanding of the ebb-and-flow of American history, since I would try to read an adult biography in advance in anticipation of questions).

The intent was to then go back to the beginning of human history and read biographies of notable persons in chronological order --- unfortunately, my wife's work schedule changed, so that bedtime reading quit happening --- probably my kids were about to age out of this anyway, but it was an interesting endeavour, and one which I have been meaning to take up again for my own sake. EDIT: and, if I should ever have grandchildren, inflict on them.