Why did the natives build such a huge door in the wall?
The film, neither the 1933 original, answers that question, but most likely the door was designed as a sacred gateway into an “other world” rather than as a simple, utilitarian opening in the wall. Medieval cathedrals in Europe have similar “large” doors, pillars, artwork and high vaulted ceilings, which serve as a psychological device for the worshipers, as if to connect them to something much larger and greater than themselves.