There are many...but i like to mention some of them. My all-time favourite is 'Gone with the wind' by M. Mitchel.This classic novel will give you all nuances of women's nature.The book is inspiring to one who is interested in human nature and savour classic novels.
To spot others,I love to say about 'Les miscerables' and ' A beautiful mind', which truly deserve a great place in the world literature in its own classes.
In the current world of practicality and competition , I surely recommend to read 'The GE way' for a bussiness savvy person to get basics of business.
