My partner and I used to have Documentary Night on Sundays. It started out with quite a good range of things -- sociology, history, arts and so on -- but we ended up in a wildlife and travel loop that got a bit repetitive, so we stopped. I'd love to find more good history, arts and science docos, especially. Things like Simon Schama's Power of Art, or James Burke's Connections.

US ones generally don't work as well for me as ones from other countries, but I did very much enjoy PBS' Prehistoric Road Trip.