First World’s Fair in the U.S. – the Centennial International Exhibition, 1876. Memorial Hall, built especially for the World’s Fair, houses the Please Touch Museum.
First Thanksgiving Day Parade in the U.S. in 1919.
First international-style skyscraper in the U.S. – Loews Philadelphia Hotel (12th & Market Streets), formerly the PSFS (bank) Building, 1932. This was also the first totally air-conditioned building in America.
First orchestra to appear in a motion picture (1937), on television (1948) and to tour China (1973) – Philadelphia Orchestra.
Oldest continuously occupied street in the U.S. – Elfreth’s Alley, since 1713.