Much more fun than the average stuff C-Span shows are the BookTV episodes that air on the weekend. Here are a few episodes I've enjoyed that deal with history:

Destiny of the Republic by Candice Millard
--->http://tinyurl.com/7fmecph

I liked this episode quite a bit since it's a fascinating subject with a very personable author. If you've ever wondered about President Garfield and his assassination I highly recommend it.

More recent episodes:

Decoding Clausewitz by Jon Sumida
---> http://tinyurl.com/7qbskkx

Inferno: The World at War, 1939-1945 by Max Hastings
---> http://tinyurl.com/6ohsje4

Civilization: The West and the Rest by Niall Ferguson
---> http://tinyurl.com/88uu2q8

I'll dig up some of my older favorite ones in the future.

C-Span always has the very best sitcoms.