Some of these treasures are over 2,000 years old, and the Vatican has held them for five centuries. Key Points:The Vatican City holds uncountable amounts of books and treasures that it refuses to let the world see. Most of the historicity and information about these treasures we have to rely on the Vatican to provide. #8 Illustrated Manuscript of Dante’s Divine Comedygrauy / Getty ImagesDate : Approximately 1480sOriginally, Sandro Botticelli included 92 full-page illustrations in the manuscript. #12 Sarcophagus of Saint Helenapiola666 / E+ via Getty ImagesDate : 335 ADHelena, the mother of Emperor Constantine the Great, was entombed in 335 AD.