MrBeast and his team embark on a 100-hour adventure exploring ancient Mayan temples and discovering hidden secrets deep underground. They visit various historical sites, including a 2,000-year-old temple containing a funerary mask of a snake kingdom king, and the ruins of a city that once housed over 100,000 people. They also explore a sacred cave believed to be the origin of humanity and play an ancient Mayan ball game where the losing captain's head was cut off. The journey culminates with a visit to Chichen Itza, one of the seven wonders of the world.