I know central America had the Aztecs and so on, and in Peru there was the Incas. What about the rest of South America though? (Or lower central America, tbh). Were there other urban cultures besides the Incas? The stereotype I have is just thousands of square miles inhabited by hunter-gatherers and perhaps the occasional hut-dwelling villages. But I know that's not true in North America, so I assume it can't be in South America.