The National Maritime Museum is located in Greenwich, London, England, and consists of three connected museums: the Maritime Museum, the Royal Observatory and the Queen's House. The National Maritime Museum is situated on the scenic and charming Greenwich World Maritime Heritage Site, where the Meridian Line and London's only observatory are located. The museum houses the world's most important British maritime history collection, including ship models, maps, manuscripts, navigational instruments, timers and observatories. It also houses the world's largest maritime history reference library.