The audioguide tells the story, describes the architecture and reports interesting facts about the basilica.Saint John the Evangelist preached in this place.Tradition tells us that John, the apostle of Jesus, was placed in a cauldron of boiling oil, but came out miraculously uninjured and safe. The real gem of this church are the medieval frescoes, discovered during the restoration works of the last century. You can examine the 3D model of the church and observe its interior, through the MuByz App. The audioguide has been made by professionals in the field of history and art.