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Host Giorgio Tsoukalos probes the series archives to explore remarkable ancient structures that defy conventional explanation. From the precisely cut stone blocks at Puma Punku, to the gigantic temples of Malta, and the megalithic city of Nan Madol, could these mysterious sites contain evidence of extraterrestrial contact in the distant past?
First Air Date : Apr 20, 2010
Last Air date : Mar 05, 2026
Episode : 285 Episode
Season : 22 Season
Runtime: 42:60 minutes
Studio: History
Country: United States of America
