For those interested in very early human history, this 2010 documentary by Werner Herzog:

https://en.wikipedia.org/wiki/Cave_of_Forgotten_Dreams

It was filmed in 3D as was the hype at the time, but the 2D version is completely watchable and is the most commonly distributed format.

Hey, thanks for this recommendation! Just watched it and enjoyed it. Very interesting and unexpectedly spiritual. (This must be the one and only Herzog film I've managned to watch to the end.)