We like to think that we know mostly everything about our planet and the history of our world. This is true for the most part, but every now and then a completely mind-blowing discovery comes to light that changes everything we thought we knew. There is no knowing how many secrets still remain hidden in our world, but these next insane discoveries are quite a lot to process already! From ancient egg globes to mysterious and unknown civilizations, follow along for 15 Times Researchers Discover What No One Was Supposed to See.