Hmm.. I only watch historical documentaries, not what OP wanted, but might be interesting for someone nevertheless. Michael Wood and John Romer produced some of my favorite documentaries, watched them all several times and with great interest. Very well done, and you will learn much about the subject:
The Story of India - no Youtube link, BBC fgts blocked it outside of UK
- first out of six parts
- first out of four parts
- first out of seven parts, you can find playlists on youtube easily, if interested
And here is one more about Christinanity - BBC made, weaker than John Romer's imo, but covers other aspects and is generally rather good:
- first out of six parts, can find the rest searching for "BBC History of Christianity", there are playlists
Btw, no offence US guys, but all of your historical documentaries are garbage, or have a preschool target-group... May be only US civil war related, about the Indian wars in NA, etc. - those are ok. Don't be mad, but it's true :)