Federal Hall is the name given to the first of two historic buildings located at 26 Wall Street, New York City. The original, a Greek Revival structure completed in 1703, served as New York's first City Hall.
From the National Park's Website: "Here on Wall Street, George Washington took the oath of office as our first President, and this site was home to the first Congress, Supreme Court, and Executive Branch offices. The current structure, a Customs House, later served as part of the US Sub-Treasury. Now, the building serves as a museum and memorial to our first President and the beginnings of the United States of America."