Old St. Peter's Basilica
"Section and Interior View of the five-aisled Basilica of S. Pietro at Rome, before its restoration. Large basilicas sometimes have as many as five aisles — namely, a main-aisle in the middle, and two lower aisles on each side."
A. Rosengarten, W. Collett-Sandars A Handbook of Architectural Styles (New York, NY: Charles Scribner's Sons, 1895)
Courtesy the private collection of Roy Winkelman