It depends what you're interested in really. I particularly enjoyed the one about the Khmer because it's a civilization I knew so little about before listening.

I've only discovered the channel this week and I'm a sucker for doing things in order, so I've not even got half way yet. Of the ones I've watched, there's really none I wouldn't recommend, different as they've been so far.

You basically can't miss. Pick out the cultures you're interested in, or slowly go through episode by episode like I'm doing. :)