Mexico's Lost Megaliths: The Forgotten Tombs of Guirun, Oaxaca

High on a remote mountaintop in southern Mexico stands one of the grandest and most mysterious megalithic structures in the ancient Americas. Built in the shape of a cross of huge stone blocks over 12 feet long and weighting as many as 15 tons, it was only recently rediscovered after having briefly reported and excavated over a century ago. Its megalithic style and refined carvings offer a striking contrast with the extreme simplicity of the nearby ruins, as if the two belonged to entirely different epochs and entirely different builders. Nothing like this exists in any other part of Mexico or ancient Mesoamerica, its purpose lost into the mists of time. Was it a tomb, like the subterranean chambers of Mitla, just a few miles away? Or was it something else altogether, an astronomical observatory perhaps, or something even stranger? Follow us to this remote and virtually unexplored site, where we will be uncovering the remnants of a whole lost city of huge, forest-covered buildings, mysterious tunnels, and unexplained megalithic constructions.