prior to the addition of the apse (1903) With its grand façade, vaulted dome, ornate main altar, eight side chapels and main
sanctuary that comfortably holds 2,000 worshippers, the Cathedral Basilica of Saints Peter and Paul is the largest brownstone structure and one of the most architecturally notable structures in the city of
Philadelphia. The basilica was built in a
Roman-
Corinthian style of architecture, modeled after the
Lombard Church of St. Charles (San Carlo al Corso) in
Rome. On the basilica exterior, the Palladian façade and aqua oxidized-copper dome are in the
Italian Renaissance manner The basilica interior features an oversized
apse of stained glass and red antique marble in proportions reminiscent of Roman churches. A
baldachin made of Italian marble covers the main altar. The three altars on each side aisle are designed in Italian Renaissance style. The Crypt of the Bishops is located in the basement of the basilica
Architects and designers To begin the cathedral project, Kenrick in 1846 tasked Reverend Mariano Muller and the Reverend John B. Tornatore with drawing the initial plans for the structure. Kenrick hired the Philadelphia architect
Napoleon LeBrun to run the project. LeBrun had previously built the
Philadelphia Academy of Music. LeBrun used the
Basilica of Sant' Ambrogio et Carlo al Corso, a
Neo Classical style Italian Renaissance church in Rome, as his inspiration.
Constantino Brumidi painted the ceiling mural in the dome,
The Assumption of the Virgin into Heaven in 1868, and the round portraits of St. Matthew, St. Mark, St. Luke, and St. John on its
pendentives. Architect Henry D. Dagit renovated the cathedral interior in 1914, adding the apse behind the high altar.
D'Ascenzo Studios executed the apse's stained glass windows and mosaic murals. ==Crypt of the bishops==