That's Old Ironsides, the USS Constitution.
http://www.ussconstitution.navy.mil/
Commissioned in 1797.
Defeated the HMS Java, HMS Guerrier, HMS Cyane, and HMS Levant in the War of 1812.
She spent the 1850's patrolling the coast of Africa looking for slavers and pirates, and in 1871 was refit as a training ship.
Restored in 1925, Recommissioned in 1931, and was towed to various port cities as part of a goodwill tour.
In 1941, she was given permanent commission, and placed as a museum in Boston Harbor.
In 1997, after several years of repairs and refits, she sailed for the first time in over a decade using just the wind to power her.
She remails a fully commissioned US Navy vessel, and her crew is all US Navy personnel. The ship sails every July 4, and for several special events a year.