From the Wikipedia page 
The National Maritime Museum (NMM) in Greenwich, England is the leading maritime museum of the United Kingdom and may be the largest museum of its kind in the world. The historic buildings forming part of the Maritime Greenwich World Heritage Site, it also incorporates the Royal Observatory, Greenwich, and 17th-century Queen's House. The museum is a non-departmental public body sponsored by the Department for Culture, Media and Sport. Like other publicly funded national museums in the United Kingdom, the National Maritime Museum does not levy an admission charge although most temporary exhibitions do incur admission charges.
The website is .