Transylvania and Dracula

No, not this Dracula, but the character, the "written" version that seems to captivate the Western World.
Twilight madness, again.
Let me be the first to admit I have not either read or seen the books or movies, but really what is the obsession about Dracula and vampires?
I understand it is an North American thing, but really, how about a movie on say the countess of the blood?