Navy photo of USS Constitution under sail for the first time in over a century 21 July 1997

USS Constitution is a wooden-hulled, three-masted heavy frigate of the United States Navy. Named after the Constitution of the United States of America by President George Washington, she is the oldest commissioned naval vessel afloat in the world. Launched in 1797, Constitution was one of the six original frigates authorized for construction by the Naval Act of 1794. Joshua Humphreys designed these frigates to be the young Navy's capital ships, and so Constitution and her sisters were larger and more heavily armed and built than the standard frigates of the period. Built in Boston, Massachusetts at Edmund Hartt's shipyard, her first duties with the newly formed United States Navy were to provide protection for American merchant shipping during the Quasi War with France and to defeat the Barbary pirates in the First Barbary War. and her sisters were larger and more heavily armed 

Constitution is most famous for her actions during the War of 1812HMS Guerriere, Java, Pictou, Cyane and Levant. The battle with Guerriere earned her the nickname of "Old Ironsides" and public adoration that has repeatedly saved her from scrapping.  WIKIPEDIA