Well I'm fond of historical events and series as well as movies based on those ideas. So the first season which made me addicted was Game Of Thrones, it was really great in the beginning but later on due to hype and other issues now its just pleasing audience. After GOT the second season I watched was Vikings. I'm done with almost all the episodes of Season 5 released till now. In the start you might feel its a bit boring but with time you'll surely like it. The acting of Ragnar and later after his death the conflict between his sons will surely make you addicted to this series. There's a bit similar season to Vikings, The Last Kingdom but I was much into Vikings. As after the death of Ragnar who was hero for Vikings because of his successful raids on England the conflict between Sons of Ragnar begins for Power. Ragnar had two wives and from first one he had 1 son Bjorn and from second one he had 4 sons but Ivar was special. He was cripple but he's the ruler of Viking's kingdom and is trying to avenge his mothers death from Ragnar's first wife (Lagertha killed Ivar's mother and he was very close to her mother).
I hope you'll enjoy the series if you are fond of Action & Historical Fiction.