Footnote: Underneath St. Peter’s Basilica, Rome

One of the air vents for the crypt in St. Peter’s Basilica, Rome, 2012. “There are over 100 tombs within St. Peter’s Basilica (extant to various extents), many located in the Vatican grotto, beneath the Basilica. These include 91 popes, St. Ignatius of Antioch, Holy Roman Emperor Otto II, and the composer Giovanni Pierluigi da …