Could Ancient Egypt’s most iconic monuments have been built with extraterrestrial assistance? In the second episode of our series on some of history’s most well-known conspiracy theories, we delve into the idea that aliens helped built the pyramids. In conversation with Rob Attar, Egyptologist Joyce Tyldesley explores the origins of the theory and explains what we know about how the pyramids really were constructed.

History’s Greatest Conspiracy Theories is produced by the team behind BBC History Magazine. For more fascinating stories from the past, head to HistoryExtra, the home of ‘History’s Greatest’ podcasts. There you can find other feeds including History’s Greatest Cities and HistoryExtra LongReads. Find out more at historyextra.com/podcast.

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This episode was hosted by Rob Attar and produced by Jack Bateman.

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Did aliens build the pyramids?