This 46-gun ship of war, commissioned in 1824 by the Royal Navy, is now the oldest British-built ship afloat. It has been restored and visitors can explore all four decks: the quarterdeck, with its 32-lb. carronades; the gun deck, with its battery of 18-lb. cannons and captain's quarters; the berth deck, with its officers' cabins and crew's hammocks; and the orlop deck and hold. Various displays portraying life in the navy and the history of the Unicorn make this a rewarding visit.