MEXICO CITY: This impressive modern museum, visited by 2 million people every year, tells the story of Mexico from before the Mayan civilization to the Spanish conquest.

In this episode, a chemical engineer and some Mexican athletes help us discover whether the rubber ball used on the ancient Mayan playing field contained a human skull. We dive into a watery cave to discover the Mayan path to the afterlife, then investigate the power of a crystal skull to reveal the secrets of the dead. We pilot an ancient canoe through Aztec canals to discover why modern Mexico City is sinking, then discover how a valiant gladiator defeated a score of Aztec warriors armed with the world’s sharpest swords. And finally, we discover how a dress worn by the most notorious woman in Mexican history led to a massacre that changed history.