How do you think could it possibly be that all we knew about Earth history was fake? 

We still don't know who (how and why) has builted the great Pyramids (By the way, do you know that there are Pyamids in Mexica, South Amerika and Russia too?), Stonehenge and so on? 

Whos paints are on  the Nazca plateau? 

Perhapse there are much more information about our planet, our life and our history>