Are there any non-crap learning channels?

The History Channel has changed it’s name to “History” and provided us with Ice Road Truckers, Ax Men, Armageddon, Nostredomous, Life After People, Pawn Stars, America: The Story of Us, Sliced, and Decoding the Past. The Discovery Channel has Cash Cab, and other similar reality shows with crumbs of trivia thrown in. TLC, I was shocked to learn, is actually “The Learning Channel”, but brought us Jon & Kate Plus 8, the furthest thing from learning possible.

Are there any channels that air documentaries and general information anymore? An hour learning about the Sack of Rome or the history of the assembly line or how scotch is made, perhaps? Or is Say Yes To The Dress, Cake Boss, and I Didn’t Know I Was Pregnant all that there is left?