Imagine that it is night, as in the photo above. We're walking down a little path flanked by Roman tombs of the second and third century after Christ. We're at the bottom slope of the Vatican Hill. A short distance away is the imposing obelisk that stood at the center of the stadium of Caligula and Nero. That's where the apostle Peter was martyred. And along the path stands the monument marking the place where he was buried.