Philip J. Day

They are striking works of art by any standard: but what purpose did they serve? Some of the theories put forward suggest that the lines were ancient running tracks, runways for aliens, and even a giant astronomical calculator. But after decades of misunderstanding, modern archaeology may finally have an answer to the puzzle of the Nasca lines.

Over the centuries, explorers traded tales of a lost civilization amid the dense Amazonian rainforest. Scientists dismissed the legends as exaggerations, believing that the rainforest could not sustain such a huge population—until now. A new generation of explorers armed with 21st-century technology has uncovered remarkable evidence that could reinvent our understanding of the Amazon and the indigenous peoples who lived there. Using CGI and dramatic re-creations, National Geographic re-imagines the banks of the Amazon 500 years ago, teeming with inhabitants living in the Lost Cities of the Amazon.