I consider myself fairly intelligent but when I think about it I haven't read a lot of the 'classics' (not adult ones anyway, read far too many children' classics!) apart from those I did at school. For example I am embarrassed to admit I've never read any Jane Austen.
I read all sorts from fairly low brow chic lit to historical stuff, biographies etc but I tend to choose books that I know I will enjoy rather than giving anything a bit more challenging a go.
What sort of thing would be on an 'ought to have read' list?