The National Maritime Museum was formally established by Act of Parliament in 1934 and opened to the public by King George VI in 1937. It includes the 17th-century Queen's House and the Royal Observatory – home of Greenwich Mean Time and the Prime Meridian line.
National Maritime Museum, Romney Road, Greenwich
London
SE10
Daily, 10am-5pm. Open until 6pm during summer months. Closed December 24-26
Free