I always liked the idea of a TV-series about the Byzantine Empire. We got plenty of things about Rome and ancient Greece and yadda, yadda, yadda... but not a single story about the Byzantines. You know, it would be kind of like Game of Thrones but with more blinding and castration.
I had this idea that it would start right after the battle of Manzikert (1071, when the Seljuk warlord Alp Arslan kicked the Byzantines right in the balls,conquered Asia Minor and kickstarted the decline of the empire)and would end with the beginning of the First Crusade and the restoration under Alexios I Kommenos. It would have powerfull Doux(es?), fighting over the right to sit on the throne, shifty court eunuchs with immense influence and ofcourse the Varangian Guard (imagine the Spetznaz, but with huge axes and more beard) kicking all kinds of ass, be it Greek, Bulgarian or Turkish etc...
Well, I know that it will never be realized (well, without sucking) but a man can dream....