Answer: St. Peter's dome is 136 meters in height and 42 meters in diameter. The dome was designed by Michelangelo but completed by Giacomo della Porta and Domenico Fontana.

See:
 • Slideshow of Vatican Post Office Issued Postcards for the Construction of the Dome.

 • Rev. H. A. Phinney, St. Peter's Dome Vatican Notes, Volume 17 Issue 5 1969 Pages 7-8
 • Anonymous, St. Peter's Dome Vatican Notes, Volume 01, Issue 4, 1953, Page: 17-19


Vatican Air Mail Stamps
Scott # C22-C23 (1953)


Vatican Air Mail Stamps
Scott # C33-C34 (1958)