I'd highly recommend this one. It was produced and broadcast by the History Channel for 5 1/2 seasons. The series comes to an end following season 6. The first 10 episodes of season 6 were aired on the History channel. But the final 10 episodes of season 6 are airing on Amazon Prime. I think Amazon must have bought the rights to the show because the History channel doesn't even have reruns on its website anymore. Kind of a shame that the History channel changed gears in the middle of a season and didn't at least finish showing it there.
We've been watching Vikings since it first came on the air 6 years ago. Some of the story lines kind of lost me but overall I think the show is so well done.