Deep under the Vatican lies one of the world’s greatest archaeological and religious wonders. It is almost unknown to the public, and was recently opened on a very limited basis to a few carefully vetted people each day as the so-called, “Scavi Tour.” The tour is often called the, “Hottest Ticket in Rome.” Beginning 75 years ago, the Vatican began a secret search for the tomb of the Apostle Peter, whom legend said was buried on Vatican Hill after his execution by the Roman Emperor, Nero, in 66 A.D. Peter was Christ’s most important lieutenant and, with Paul, one of...