Considered to be one of the three most historically significant Colonial buildings in the United States, the Old Exhange Building is a "must see" when visiting Charleston.
http://www.oldexchange.com/
Charleston's Historic Old Exchange and Provost Dungeon was constructed in 1771. The Old Exchange is where South Carolina ratified the US Constitution in 1788 becoming the 8th state to join the union. It was used as a prison by the British occupation during the Revolutionary War.
