Secret of the Incas shot in Peru before. Wendell Corey was originally announced as star. In July 1953 Paramount took over Hal Wallis' contract with Charlton Heston and announced he would make the film after he finished "The Naked Jungle". "Secret of the Incas" was filmed on location in Peru at Cuzco and Machu Picchu, the first time that a major Hollywood studio filmed at this archeological site. A sixteen person unit including Heston, producer Mel Epstein and director Jerry Hopper spent a month filming footage in Peru in 1953. Five hundred indigenous people were used as extras in the film. The film also
Machu Picchu an Inca grass rope bridge, across the Urubamba River in the Pongo de Mainique, provided a secret entrance for the Inca army. Another Inca bridge was built to the west of Machu Picchu, the tree-trunk bridge, at a location where a gap occurs in the cliff that measures . The city sits in a saddle between the two mountains Machu Picchu and Huayna Picchu, with a commanding view down two valleys and a nearly impassable mountain at its back. It has a water supply from springs that cannot be blocked easily. The hillsides leading to it were terraced, to provide