The buildings and 47 retired ships at the 80-acre dockyard across the River Medway from Rochester constitute the country's most complete Georgian-to-early-Victorian dockyard. Fans of maritime history could easily spend a day at the exhibits and structures. The dockyard's origins go back to the time of Henry VIII; some 400 ships were built here over the centuries. There's a guided tour of the submarine HMS Ocelot, the last warship to be built for the Royal Navy at Chatham. Save your ticket, as it's good for a year.