Josh Gates and his team join noted archaeologist Dr. Richard Hansen on an adventurous quest to the lost-city of El Mirador deep in the Guatemalan rainforest. Their mission: to find the hidden tombs of the mysterious Maya Snake Kings. Archaeologists have discovered that the sprawling ruins of this ancient mega-city are larger than Los Angeles and contain what might be the largest pyramid in the Americas. Josh explores overgrown temples, plaster-paved roads, and evidence of advanced engineering and art. Using advanced laser scanners and remote sensing technology, Josh and his team reveal the secrets of why this incredible civilization suddenly and completely vanished. Their search for the tombs of the elusive Snake Kings leads to a thrilling and dangerous adventure, and culminates in what may be the most significant discovery in Expedition Unknown history.