future riots, the builders would throw stones into the air to determine the height of where the windows would be placed. In 2017, the shrine of Saint Katharine Drexel was relocated to the cathedral after its former home, St. Elizabeth's Convent, was closed and sold off by the Sisters of the Blessed Sacrament. Building 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". Architects and designers The basilica was designed by Napoleon LeBrun based on plans drawn up by the Reverend Mariano Muller and the Reverend John B. Tornatore, and by John Notman who added the dome and facade. LeBrun supervised the project from 1846 to 1851, when Notman took over until 1857, after which the cathedral was completed under LeBrun's supervision. LeBrun was a native Philadelphian born to French-Catholic parents. He designed numerous churches throughout Philadelphia, including St. Patrick's Catholic Church, Twentieth Street (1841); the Seventh Presbyterian Church (1842); the Scot's Presbyterian Church (1843); the Catholic Church of St. Peter the Apostle (German), Fifth Street (1843); and the Protestant Episcopal Church of the Holy Nativity (1844), no longer standing. Other notable buildings he designed include the Philadelphia Academy of Music. Notman is most noted for his Philadelphia ecclesiastical architecture for the Protestant Episcopal Church, including St. Mark's Church, Locust Street (1850); St. Clement's Church, Twentieth Street (1857); and the Church of the Holy Trinity, Rittenhouse Square. He also designed the Athenaeum of Philadelphia and parts of the New Jersey State House. Constantino Brumidi painted the ceiling mural in the dome—The Assumption of the Virgin into Heaven (1868)—and the round portraits of St. Matthew, St. Mark, St.