Director: Philip J. Day

Nasca Lines Decoded

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.

Lost Cities of the Amazon

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.