The Crucifixion of St. Peter by Michelangelo

Watch New York Times best-selling author John O’Neill discuss his new book—"The Fisherman’s Tomb"—which tells the story of a secret archeological project underneath St. Peter’s Basilica in Rome that discovered the 2,000-year-old bones of a man who had been crucified upside down.

"The bones that had been originally found, she had tested," O'Neill said. "Those bones were the bones of a woman, not a man. So, they couldn't be Peter's bones."

But then she found the inscription: "Peter is near."