The History Channel, now just History, has really gone down hill in the past decade or so, in my humble opinion.  Sure, there’s still some good stuff on there that I’ll go out of my way to watch, Ancient Aliens being one such show, but it’s less to do with history and more to do with bad reality television (and you can dispute Ancient Aliens’ historical accuracies, but it actually has history in it with some very interesting theories and perspectives).  That said, the other show I’ll go out of my way to watch on the channel formerly known for its great historical documentaries is Vikings.  Now, it’s not a documentary, but this drama series is historical in nature and just genuinely awesome.  If you haven’t watched it yet, I highly recommend it (seriously, it’s much more worth your time than watching poor bastards being screwed over in a pawn shop because they’ve never heard of eBay or craigslist).