Buried: Knights Templar and the Holy Grail

Across time, no group has been more guarded or more skilled at crafting a world hidden from sight than the Knights Templar. In this investigative series, a team will piece together the Knights' movements from the fall of Jerusalem to the mass burning of its members in Paris, unraveling their secrets along the way. Over four serialized episodes, our investigative team will set out to unearth the secret covert network of the Knights - an underground labyrinth nearly four thousand miles wide - and dive into the storied history of one of history's most enigmatic groups. (History Channel)