HMS Unicorn and her near-sister ship, HMS Trincomalee, are surviving sailing frigates of the successful Leda class, although the original design had been modified by the time that the Unicorn was built, to incorporate a circular stern and "small-timber" system of construction. Listed as part of the National Historic Fleet, Core Collection, Unicorn is now a museum ship in Dundee, Scotland, United Kingdom. Unicorn was never rigged, and only went to sea for the voyage from Chatham to Dundee, during which she was under tow. It is thought the roof that covers her upper deck has never been replaced.