Secrets Unlocked: Series 1_Part 10: The Holy Grail

The quest for the Holy Grail has consumed knights and crusaders and inspired legendary tales and blockbuster films. Could the epic search finally be over? A church in Spain says they have found the sacred chalice, but some experts believe this is just the latest in a long line of false claims. Join host Adam Mastrelli as we trace the extraordinary story behind Christianity's ultimate relic, using forensic and historic analysis to help solve this 2,000-year-old mystery.