Why Such A Mystery?

If you have read about the history of civilizations that were here before us then you must know that every civilization had some mystery or secret that made them different from others. Some believed in the existence of god and some did not. Every civilization made sure that they leave their mark on the history so that people read about them and learn about them. But there was much civilization that stayed hidden in the entire course of history. But Why? Maybe they had their own secret that stayed hidden, until now.
No, the secret is not about Egypt. If you think we are lying than check out the video at the end of the article and see by yourself.