The Travel Channel has a program that is fairly decent. "John Ratzenberger's Made In America" is a half hour program that tours America and visits famous businesses, sites, etc. Tonight, they aired two episodes that toured the Corvette factory, the U.S. Mint in Philadelphia, and the Ruger factory in Newport, New Hampshire.
The Sturm Ruger factory in Newport is 36 miles away from where I grew up, which is about an hour's drive. I found it interesting how molds, stocks, etc. are made. They showed the process of making a Ruger rifle (in general) from start to finish. It was worth seeing.