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In 1925, British explorer Percy Fawcett vanished into the Amazon rainforest while searching for a lost civilization he called "Z." Accompanied by his son and a family friend, he entered one of the least-mapped regions on Earth—and was never seen again.

In this episode of History Shorts, we explore the mystery that made Fawcett a legend, but also the larger story that is often forgotten: the race to chart the Amazon's final blank spaces. Long before satellites and GPS, vast portions of South America's interior remained unknown to the outside world. Explorers, scientists, soldiers, and adventurers risked disease, starvation, hostile terrain, and isolation in an effort to map rivers, mountains, and entire regions that had never appeared on modern maps.

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