The 1956 film 'The Conqueror' is infamous for more than just the miscasting of John Wayne as Genghis Khan. It is known as the 'deadliest' production in Hollywood history. Filming took place in Snow Canyon, Utah, which was just 137 miles downwind of the Nevada National Security Site, where the U.S. government had recently conducted 11 atmospheric nuclear bomb tests. The cast and crew were exposed to radioactive fallout; Howard Hughes, the producer, even shipped 60 tons of the radioactive dirt back to Hollywood to use on interior sets for continuity. Over the following decades, 91 of the 220 cast and crew members developed cancer, and 46 died from it, including stars John Wayne, Susan Hayward, and director Dick Powell. Though the government denied the link for years, the film remains a chilling example of the 'Atomic Age's' hidden costs.