Giorgio Tsoukalos takes a look back at some of the structures visited all over the world that could provide undeniable evidence of extraterrestrial contact.
Director:
Robin Feinberg
Cast:
Robert Clotworthy
Giorgio Tsoukalos
Erich von Däniken
David Childress
William Henry
Linda Moulton Howe
David Wilcock
Jonathan Young
Jason Martell