Overall view of Ghiberti's "Gates of Heaven" on the Baptistry, with  marble sculpture of Jesus being baptized by St. John, made in 1505  by Andrea Sansovino (c1467-1529).  The angel looking on is a later 18th century work by a lesser sculptor, Innocenzo Spinazzi.  The gold doors in place are replicas of the originals which are kept in the museum.