Deadliest Warrior is very useful for seeing weapons in action. They also have the Tudors, some of which is good. Avatar: Last Airbender is probably the best fantasy TV show ever made (the third season is incredible), though some people can't get over that it's a cartoon. There's Legend of the Seeker, which I thought was better quality than the books. Xena and Hercules are both there. And of course, there's Dr. Who. All of those are on Netflix.