St. Patrick's Cathedral is constructed of white marble from New York State and Massachusetts. The massive Cathedral measures 400 feet long and 174 feet wide. Its two front spires rise 330 feet above street level. The Cathedral seats approximately 2200 people.
St. Patrick's is home to a number of artistic treasures. Several of the stained glass windows were crafted in Chartres, France, after designs from the famous cathedral there. Two of the altars, the St. Michael Altar and the St. Louis Altar, were designed by Tiffany and Company, and another, the St. Elizabeth Altar, by Paolo Medici of Rome. The Cathedral houses a replica of Michelangelo's "Pieta", three times the size of the one in Rome.
St. Patrick's has two organs, the Chancel Organ, a pipe organ with 1480 pipes and the Gallery Organ, a chord organ, added in 1930, with two consoles and 177 stops. The Cathedral is noted for its fine acoustics, and the Cathedral hosts a periodic schedule of free concerts, featuring the organs, the parish choir, and, usually, guest artists.
The eight deceased Archbishops of New York, six of them Cardinals, are buried in the crypt below the sanctuary. Their symbolic red hats, called "galeros", hang above each of the graves.