Whilst a list like this would differ for everyone, it is a diverse list and has definately introduced me to movies I enjoyed that I may never have selected otherwise, (and also one or two I would rather chew one of my fingers off than sit through again). The inclusion of contoversial movies like Birth of a Nation are a valuable insight to how societies grow and change throughout time, and being guided through the decades from the very first silent movies right through to the present gives insight into how the movie industries change and evolve based on their stars, what was happening in the world at the time.
