If you want to learn how they spoke in the Wild West, then go for it. The best stuff is not even scripted dialogue, but actual, authentic, unscripted, spontaneous speech between people. But ultimately, the main thing is that listening to something is better than listening to nothing. And if you want to watch the Secrets of the Great Bridges Castles, then do that rather than do nothing. They've got other stuff as well - Ricky Gervais' IT Crowd and True Grit among them.