I try to recommend to as many people as possible the documentaries of Frederick Wiseman, a filmmaker who’s been directing & editing observational, fly-on-the-wall documentaries (without any non-diagetic music, narration, or talking-head style interviews) of various institutions for 50+ years. Through this project it becomes a documented history of culture as it's evolved in that matter of time through a lens of serious critique. You can pick any from out of a hat or based on whichever title interests you, but a good start is High School (1968).