USS Constitution is a wooden-hulled, three-masted heavy frigate of the United States Navy, named by President George Washington after the Constitution of the United States of America. The boat is the world's oldest commissioned naval vessel afloat. Launched in 1797, Constitution was one of six original frigates authorized for construction by the Naval Act of 1794 and the third constructed, built in Boston, Massachusetts, at Edmund Hartt's shipyard. Constitution is berthed at Pier One of the former Charlestown Navy Yard, at one end of Boston's Freedom Trail. She is open to the public year round.