There were approximately 10 million Native Americans living in the Americas when Columbus arrived. They had been here for over 12,000 years already when the first Europeans had voyaged across Atlantic Ocean; regardless of whether it was the Leif Erickson and the Vikings or Columbus and the Spanish. The diversity in culture and sophistication of the indigenous people varied across the New World just as it did in the Old World. The website below offers a glimpse into some of the more developed civilizations of the Americas.