_Interior._
613½ feet long.
152½ feet, height of Nave.
87½ feet, width of Nave.
33¾ feet, width of Aisles.
197¾ feet, width of Basilica.
446½ feet, length of Transepts.
95¼ feet, height of Baldacchino complete.
139 feet Cupola, interior diameter.
179 feet Cupola high.
277 feet above Floor.
440 feet from Pavement to Base of Lantern.
_Area._
240,000 square feet.
[Illustration: INTERIOR OF S. PETER'S.]