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Unexplained Structures

If ancient aliens visited Earth, can evidence of their existence be found in the mysterious structures that still stand throughout the world?

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Name Type Role
Deborah 'Debbie' Blum Writer
Robert 'Rob' Beemer Producer Supervising Producer
Tree Wright Producer
Rich Monahan Producer Supervising Producer
Erich von Däniken Guest Star Self - Author, Chariots of the Gods
John Brandenburg Guest Star Self - Engineer
Nicholas Howarth Guest Star Self - Geographer, Oxford University
Andrew Collins Guest Star Self - Author, Gateway to Atlantis
Christopher Dunn Guest Star Self - Author, Lost Technologies of Ancient Egypt
Rusty McClure Guest Star Self - Author, Coral Castle
Philip Coppens Guest Star Self - Author/Investigative Journalist
Jorge Luis Delgado Mamani Guest Star Self - Co-Author, Andean Awakening
Linda Moulton Howe Guest Star Self - Investigative Journalist, Earthfiles
George Noory Guest Star Self - Radio Host, Coast to Coast AM
David Childress Guest Star Self - Author, Technology of the Gods
Giorgio A. Tsoukalos Guest Star Self - Publisher, Legendary Times Magazine
Graham Hancock Guest Star Self - Author, Underworld: The Mysterious Origins of Civilization
Sara Seager Guest Star Self - Prof. of Planetary Sciences, MIT
Jason Martell Guest Star Self - Author, Knowledge Apocalypse
David Wilcock Guest Star Self - Author/Filmmaker
Robert Schoch Guest Star Self - Geologist/Author
Susan E. Leventhal Executive Producer for HISTORY
Scott Hartford Executive Producer Co-Executive Producer
Kevin Burns Executive Producer
Kim Sheerin Executive Producer Co-Executive Producer