Michelangelo designed the famous dome, and it was intended to rival Brunelleschi's dome in Florence. The dome is the photos in the world at 452 feet. It is just slightly smaller in diameter than the Pantheon and Brunelleschi's dome. The design, as executed by Michelangelo, is quite similar to that of the dome in Florence, as he also used two shells of brick, the outer having 16 stone ribs (twice the number used by Brunelleschi). Michelangelo died before the dome was completed, but he left some drawings and a wooden model, and it was completed by Giacomo della Porta and Domenico Fontana in 1590, although they did not execute the massive sculptures of Michelangelo intended to stand upon the buttresses of the drum to stabilize the mass. Michelangelo prepared the dome with double support columns to act as buttresses when he was thinking of creating a hemispherical dome. When the design was changed to make the more ovoid dome, it was decided that the support was not needed, as the buttresses were barely stressed by the more vertical shape.
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