Citizen Kane

The beginning of the movie "Citizen Kane" was very puzzling and mysterious to start off as the Protagonist / Tycoon "Kane" sunk into a deathly state expressing one last word before he died "Rosebud" The director then follows up with dropping a few discreet examples of symbolism, as the men who's faces were concealed in the dark were the only two men in which did not know what was going on around them. I like the beginning, and I'd like to see what that word "Rosebud" means.