 The City of the Gods (Teotihuacan) is home to the third-largest pyramid in the world; is many times larger than the largest Mayan and Aztec cities ever built; and today it s the world s biggest ghost town. At its height, more people lived in the City of the Gods than in any European city for centuries to come. But it now lies in silent ruins with no inhabitants left to explain what happened here -- or why. That s about to change. Josh Bernstein soars above the great city; crawls down dangerous mining shafts below it; and even plays one of the world s oldest sports...all in the hunt for clues to Mexico s most mysterious mecca.