USS Constitution and Charlestown Navy Yard (naval architecture and preservation)

USS Constitution, launched in 1797 and nicknamed 'Old Ironsides,' is the oldest commissioned warship afloat and is berthed at the Charlestown Navy Yard in Boston. The ship's original heavy timber construction and subsequent conservation treatments illustrate late-18th-century wooden warship design and modern preservation practices. The adjacent USS Constitution Museum interprets the vessel's construction, service history, and ongoing restoration work.