Cathedral   The Cathedral Basilica of Saints Peter and Paul, head church of the Roman Catholic Archdiocese of Philadelphia, It was built between 1846 and 1864, and was designed by Napoleon LeBrun, from original plans by the Reverend Mariano Muller and the Reverend John B. Tornatore, with the dome and Palladian facade, designed by John Notman, added after 1850.[2] The interior was largely decorated by Constantino Brumidi. 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 cathedral, presented in a Roman-Corinthian style of architecture, is modeled after the Lombard Church of St. Charles (San Carlo al Corso) in Rome. Its Palladian façade and aqua oxidized-copper dome are in the Italian Renaissance manner, as is the spacious interior, which features an oversized apse of stained glass and red antique marble in proportions reminiscent of Roman churches. A baldachin (canopy) over the main altar and the three altars on each of the side aisles point up this Italian Renaissance flavor. In the bowels of the building is the compact "Crypt of the Bishops".