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In page Two Flags West:

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The movie was filmed on location at San Ildefonso Pueblo, New Mexico, using buildings of the Pueblo for those of the Fort Thorn, and on the nearby Shipman Ranch near Black Mesa,[1] which is seen prominently in the film. The local Tewa inhabitants agreed to use of their community, some of whose buildings dated back 400 years, when director Robert Wise promised that filming would remain clear of the tribal kiva (underground council room), cemetery, and sacred shrines.[2]