St. Patrick's Cathedral was constructed starting in 1858 to accommodate the growing Archdiocese of New York and to replace St. Patrick's Old Cathedral. Work was halted in the early 1860s during the American Civil War; the cathedral was completed in 1878 and dedicated on May 25, 1879. The archbishop's house and rectory were added in the early 1880s, both by James Renwick Jr., and the spires were added in 1888. A Lady chapel designed by Charles T. Mathews was constructed from 1901 to 1906. The cathedral was consecrated on October 5, 1910, after all its debt had been paid off. Extensive restorations of the cathedral were conducted several times, including in the 1940s, 1970s, and 2010s.
St. Patrick's Cathedral is clad in marble and has several dozen stained glass windows. It measures 101 m long, with a maximum width of 53 m at the transepts. The bronze doors that form the cathedral's main entrance on Fifth Avenue are flanked by towers with spires rising 100 m. The northern tower contains nineteen bells, and the interior has two pipe organs. Inside is a nave flanked by several chapels; two transepts; a chancel and apse; and a crypt. East of the apse are the rectory, Lady chapel, and archbishop's residence facing Madison Avenue.
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Visby Cathedral (also known as St. Mary’s Church) is the only survived medieval church in Visby. It was originally built for German merchants and inaugurated in 1225. Around the year 1350 the church was enlarged and converted into a basilica. The two-storey magazine was also added then above the nave as a warehouse for merchants.
Following the Reformation, the church was transformed into a parish church for the town of Visby. All other churches were abandoned. Shortly after the Reformation, in 1572, Gotland was made into its own Diocese, and the church designated its cathedral.
There is not much left of the original interior. The font is made of local red marble in the 13th century. The pulpit was made in Lübeck in 1684. There are 400 graves under the church floor.