This map, from 1927, was used internally at Paramount Pictures to find locations in California which could stand in for distant locales. California’s geographic diversity is one of the major reasons why Los Angeles became the global nexus of film production.
Another reason was the sunny weather. Early film stocks were far less sensitive than what we have today, and the sun was the only light powerful enough to register an image. Indoor sets would be built without roofs for this reason. ↩