You might be interested in something from The Teaching Company. Some libraries carry them, so you don't have to always buy them yourself. They have some programs on sale right now though, although the one that I have heard in the history category is not. My boyfriend gets lots of their programs. In history, we have listened to:
Classical Archaeology of Ancient Greece and Rome
(36 lectures, 30 minutes/lecture)
Course No. 3340
Taught by John R. Hale
University of Louisville
Ph.D., University of Cambridge
http://www.teach12.com/ttcx/CourseDescL ... 20Medieval
The instructor is fun and engaging. We listened to the audio version, but they also have a DVD version.
We have also listened to several of their lessons about music composers with Robert Greenberg as the instructor. He is great to listen to and the history is much more fasinating than you might think.
They have all kinds of topics and even some that are meant for high schoolers. Go to http://www.teach12.com