Ancient X-Files: Follow investigators to a mountaintop monastery in the quest for answers about the legendary Holy Grail. And, meet the knights who've vowed to risk their lives to defend the Valencia Chalice, a sacred cup they believe to be the Grail. Then, enter the Minotaur -- a terrifying monster of ancient myth. NGC investigates: was this blood curdling story based on real places? Watch as we descend into a dark, complex cave system in an attempt to uncover the mystery.

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Documentary