The Old Exchange and Provost Dungeon in Charleston, South Carolina, is one of the great buildings of Colonial America. Serving as city hall, customs house, post office and prison; as the British Headquarters during the occupation of Charles Towne and then host to a great ball honoring George Washington, the Exchange has been an eyewitness to America's history. This stoic building—designated a National Historic Landmark in 1975—has been described as the best example of the dignity and ornament of the traditional English—exchange-town hall—design of the eighteenth century built in the United States. From within its Great Hall to deep below in the Provost Dungeon, the Exchange has played a vital role in American history.