6.CITIZEN KANE (1941)

The film that tops the most lists of best films ever, Orson Welles' overwhelming movie opens with the vast mansion of Xanadu. Inside, millionaire Charles Foster Kane breathes his last word: 'Rosebud'.

A reporter struggles to unravel the mystery of the word, and pieces together Kane's life in dramatic flashback. This is as must-watch as a film can be.

Reporter: Mr Kane, how did you find business conditions in Europe?
Charles Foster Kane: How did I find business conditions in Europe? With great difficulty.