The National Maritime Museum (NMM) is a maritime museum in Greenwich, London. It is part of Royal Museums Greenwich, a network of museums in the Maritime Greenwich World Heritage Site. Like other publicly funded national museums in the United Kingdom, it has no general admission charge; there are admission charges for most side-gallery temporary exhibitions, usually supplemented by many loaned works from other museums. Creation and official opening The museum was created by the National Maritime Museum Act 1934 under a Board of Trustees, appointed by HM Treasury. It is based on the generous donations of Sir James Caird (1864–1954). King George VI formally opened the museum on 27 April 1937 when his daughter Princess Elizabeth accompanied him for the journey along the Thames from London. The first director was Sir Geoffrey Callender. Collection Since the earliest times Greenwich has had associations with the sea and navigation. It was a landing place for the Romans, Henry VIII lived here, the Navy has roots on the waterfront, and Charles II founded the Royal Observatory in 1675 for "finding the longitude of places". The home of Greenwich Mean Time and the Prime Meridian since 1884, Greenwich has long been a centre for astronomical study, while navigators across the world have set their clocks according to its time of day. The museum has the most important holdings in the world on the history of Britain at sea comprising more than two million items, including maritime art (both British and 17th-century Dutch), cartography, manuscripts including official public records, ship models and plans, scientific and navigational instruments, instruments for time-keeping and astronomy (based at the Observatory). Its holdings including paintings relating to Vice-Admiral Horatio Nelson and Captain James Cook. An active loans programme ensures that items from the collection are seen in the UK and abroad. The museum aims to achieve a greater understanding of British economic, cultural, social, political and maritime history and its consequences in the world today. The museum plays host to various exhibitions, including Ships Clocks & Stars in 2014, Samuel Pepys: Plague, Fire, Revolution in 2015 and Emma Hamilton: Seduction and Celebrity in 2016. The collection of the National Maritime Museum also includes items taken from the German Naval Academy Mürwik after World War II, including several ship models, paintings and flags. The museum has been criticized for possessing what has been described as "looted art". The museum regards these