Its form is octagonal and the exterior is clad in white marble and green Prato marble, covered by a dome of eight segments resting on perimetral walls.
2.
Like all medieval religious buildings, the Baptistery contains tombs, one of the most interesting Renaissance wall-tombs is the tomb of Antipope John XXIII, made between 1421 and 1427. Donatello sculpted the figure of the dead Pope in gilded bronze, while Michelozzo sculpted the Madonna with Child and the Theological Virtues.