Tiwanaku - Forbidden History

Arthur Posnansky spent much of his life in Bolivia, where he conducted 50 years research on Tiwanaku. Arthur Posnansky based upon surveying of sight lines within the Kalasasaya before its reconstruction, i.e. based upon the angles created by the standing stones, thought that the Kalasasaya dated to around 15,000BC. Modern radio carbon dating suggests that the Kalasasaya might date to around 800 to 400BC while the Akapana and Puma Punku may date to around 500 to 600AD. If Tiwanaku is indeed built around 15,000BC then it's the oldest known city in the world. Shall we call America then the Old World?