No one knows for sure who built this mighty pre-Hispanic city of around 20,000 inhabitants (The Totonacs? The Huastecs?), which is why archaeologists refer to the civilization as Classic Veracruz. But one thing's for sure: this site, dating back to AD 800 and discovered by accident in 1785, is one of the most atmospheric, best-preserved and most thoroughly excavated pre-Hispanic cities in Mesoamerica. Seven kilometers away from Papantla, El Tajín's extensive ruins are easily reachable by frequent bus (M$20).