NBC's hit western series, Bonanza had a nice long run, from 1959 to 1973, and produced a whopping 431 episodes! Since the first episode aired, the Cartwrights entered the hearts of all and the Ponderosa became a household name. Who would have thought so many people would tune in in to watch a show taking place in the 1860s? The show, starring Lorne Greene, Michael Landon, Pernell Roberts and Dan Blocker was really about the American dream, and maybe that's the reason why Bonanza has become the second longest-running Western in all of television history. Here are some facts you might not have known about this exciting Western.