The Cartwrights first rode through Virginia City, Nev., in the Western TV drama series Bonanza on Saturday, Sept. 12, 1959, on NBC, and it was the first Western to be televised entirely in color. Bonanza lasted 14 seasons, making it the second-longest-running TV Western behind Gunsmoke. In honor of the occasion, we ponder some bullet points from the Ponderosa Ranch: