I always thought some adventure in South America, post WWII could be cool, maybe an Inca quest repleat with encounters of former Nazis who escaped to said continent trying to gain some magical edge to regain power...
...some non-extraterrestrial McGuffin that explains those designs that can only be seen from the sky, but really they're derived from out of body experiences achieved from some plant-based psycho-active formula that Indy gets turned onto from his father's rereading of grail clues, or some such shite...
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