 By the 16th century, the Spanish conquistadors had conquered the Incas of South America and the Aztecs of Mexico. Seemingly invincible, they looked to North America next. They left a trail of destruction from Florida to the Mississippi River, but then - among a sophisticated community of pyramid-building Native Americans - the conquistadors met their match. Who were these people and how did they fight off - and defeat - what was then the most powerful army in the world? The secret is in the pyramids. Josh Bernstein will scale these great earthen mounds, build his own pyramid, and even face death by fire ants all in a quest to unlock the secrets of America s pyramids.