Before the computing era, ILM was the master of oil matte painting, making audiences believe that some of the sets in the original Star Wars and Indiana Jones trilogy were real when they weren’t. They were the work of geniuses like Chris Evans, Mike Pangrazio, Frank Ordaz, Harrison Ellenshaw, and Ralph McQuarrie.

Check out these images, then go back and watch the original trilogy and be surprised. I never thought about how they did the huge sets, but if someone had told me that they were hand painted I would have had trouble believing it.

Source: How the original Star Wars trilogy fooled everyone with matte paintings