Relatively speaking, the Incas are recent history. One unfortunate consequence of the fame of the Incas is that they tend to crowd out the long and rich history of the region with its many kingdoms and civilizations that went before. Some pre-Inca cultures were incorporated into the Inca Empire, while others were ancient history by the time the Incas appeared on the scene. The oldest city now known in the Americas is that of Caral. It flourished at around the same time as the Egyptian pyramids were being built. The ruins of 'Sacred City of Caral-Supe' or simply 'Caral,' is...