I've recently learned that movie "7 years in Tibet" is full of lies, starting with the fact that the main character was hardcore Nazi follower in real life.
There are a lot of things that we don't know because media are not interested in enlightening people. They are interested in pushing the current agenda.
E.g. Tibet was a poor feudal state with slavery, but you won't easily find this information, because all you can find now if you search for it is: "China is bad, bad, and Tibet is very good, enlightened people, very warm and kind". It is not like that.