At some stage over the passing of the centuries, we've lost a lot of ancient knowledge. Some people think there must have been lost civilizations who once walked the face of the Earth, and all that remains of them now are their artifacts, which we're unable to understand or explain. Others feel that we simply aren't as spiritually wise or architecturally clever as we used to be, and so we no longer understand the purpose behind what our ancestors did or how they did it. Either way, the planet is covered in stunning mysteries, and here's a whole collection of them for you to gaze upon in wonder!