I always found the Jaynes' Bicameral Mind theory interesting, hypothesizing essentially Bronze age peoples did not have conscious thought, but attributed their thoughts to gods speaking to them. It's probably not true, but it's kind of like an era that can only exist through mythology and legend. So when actual details are discovered, and a little bit of the darkness is lifted, I always find it interesting

I always found it completely implausible, even outright ridiculous.