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Throughout the world, ancient objects have been found that leave archaeologists at a loss. Could these impossible artifacts suggest that advanced--and perhaps even extraterrestrial--civilizations existed on Earth thousands of years before our own?
First Air Date : Apr 20, 2010
Last Air date : Jul 02, 2026
Episode : 290 Episode
Season : 22 Season
Runtime: 42:60 minutes
Studio: History
Country: United States of America
