During a period of only 150 years, the recorded travels of three remarkable explorers expanded human understanding of vast parts of the world. Marco Polo, Ibn Battuta, and Zheng He heralded from different continents and undertook their decades-long journeys for different reasons. Yet, their personal fortitude, diplomatic skills, and keen curiosity connected cultures previously unknown to each other, paving the way for trade, innovation, and the exchange of ideas. Retrace the expeditions that changed our understanding of the world in this interactive Google Earth Voyager story.