Choco Canyon in New Mexico is an abandoned Pueblo indian settlement that was made using rock in 1000 AD, which they abandoned a hundred years later.  It is shown that the people who built the settlement had contact with the people who built the Mayan temples in Mexico since they consumed cocoa from a thousand miles away.  Evidence from tree rings shows that they were driven from the site by years of drought and perhaps due to invasion, and also evidence exists of cannibalism being practiced at that time.