The enormous "Portal el Inframundo" (Eng. Portal to the Underworld), an ancient Olmec monument, has returned to Mexico after many ordeals. For nearly 3,000 years, it adorned the walls of the ...

Below me are the ruins of the ancient city of Teotihuacan, a city founded several centuries after the mysterious collapse of the Olmec heartland. But what Teotihuacan demonstrates is the ...