I watch tv series a lot, and by a lot i mean like 4-5 hours a day:)
The first Tv show i started watching seriously was Game of thrones, and it was quite fun!
It is perfect if you're interested in Medieval type of fighting, clothing and these forts etc.
Next was Spartacus: One of the best i've watched. The storyline and everything. Sad that the male actor had to pass away IRL in season 1. Quite fun if you like Roman type of history. Reminds me a bit of the movie "300".
Now, i am watching True blood. I am currently on first episode, season 4. Season 3 was the best one imo and i am loving it!