John Wayne was furious when caught using an oxygen mask on the set of The Sons of Katie Elder, but his co-star Dean Martin praised Duke's tenacity on the picture.

John Wayne's Rio Bravo was released 66 years ago this week, and his much younger leading lady co-star, Angie Dickinson, shared how "adorable" Duke was on set.

Much like the legend of the Duke, his footprint in the historic Stockyards continues to grow; The museum honoring John Wayne just completed an expansion of its collection and gift shop.