Five hundred years before the Incas, a civilization raised this in the heart of the altiplano. The Gate of the Sun, carved from a single block of stone, and the Akapana pyramid still guard enigmas that archaeologists keep debating. You wander Tiwanaku with the cold altiplano wind at your back and the feeling of treading one of the oldest sacred centers in the Americas. A World Heritage Site, and far less visited than it deserves.