Ancient Ruins Revealed

What else can we uncover from ancient sites? Are there hidden meanings or revelations we can bring to the surface that can change our understanding on how certain people lived, thrived...or disappeared? Who were the ancient civilization in Peru that built incredible structures at the time of the Pyramids of Egypt, and why do we know nothing about them? And what was the famous megalithic Stonehenge really built for: an astronomical device or sound influencing ritual mechanism?