First stock exchange: Philadelphia Stock Exchange, 1790.
First international-style skyscraper: Loews Philadelphia Hotel (12th & Market Streets), formerly the PSFS (bank) Building, 1932. This was also the first totally air-conditioned building in America.
First World’s Fair in America: the Centennial International Exhibition, 1876. Memorial Hall, built especially for the World’s Fair, houses the Please Touch Museum.
First American convention: the Constitutional Convention of 1787, where the Constitution of the United States was written and adopted by representatives of the 13 original colonies.
First American university: The University of Pennsylvania assumed university status in 1779.
First library: The Library Company of Philadelphia, founded by Benjamin Franklin in 1731; its current location, 1314 Locust Street, is open to the public.
First U. S. Mint: established in 1792 on Seventh Street, near Arch Street, it was the first property acquired by the federal government.
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