Daily Mail - By Daily Mail Reporter and Associated Press Reporter, 4/23/13
Famous: The social structure of Teotihuacan remains a mystery after nearly 100 years of archaeological exploration at the site
A tiny robot has made a momentous archaeological discovery deep under the famous Temple of Quetzalcoatl, near the Pyramid of the Sun in Mexico, it was announced on Monday.
Experts expected to find just one ancient chamber at the end of a stretch of 2,000-year-old unexplored tunnel at the Teotihuacan site. Instead, the remote-controlled vehicle has beamed back images of three mysterious caverns.
