Discovery of an Ancient 3D "Relief Map" of the Ural Region. Discovered in China!
Do you think it impossible that in the course of at least 994,000 years of time that went by while we were here on this planet but before our history begins, that human civilization just may have done something other than dwell in caves?
Our species has been around maybe 5% or 10% of that time. And yes, it's impossible for them to have done anything of significance without leaving a lot of evidence behind. If it pleases you to believe that the "Old Ones" are coming back, and are scrunching up the corn fields to tell us about it, that's fine with me. It's your brain. Use it as you wish.