aviation or a full commercial service. Former RAF Church Fenton is also near the city and private, it is now called Leeds East. Education Museums and libraries York Castle, a complex of buildings ranging from the medieval Clifford's Tower to the 20th-century entrance to the York Castle Museum (formerly a prison) has had a chequered history. As well as the Castle Museum, the city contains numerous other museums and historic buildings such as the Yorkshire Museum and its Museum Gardens, Jorvik Viking Centre, York Art Gallery, Merchant Adventurers' Hall, the reconstructed medieval house Barley Hall (owned by the York Archaeological Trust), the 18th-century Fairfax House, the Mansion House (the historic home of the Lord Mayor) and the so-called Treasurer's House (owned by the National Trust). The National Railway Museum is situated just beyond the station, and is home to a vast range of transport material and the largest collection of railway locomotives in the world. Included in this collection are the world's fastest steam locomotive LNER Class A4 4468 Mallard and the world-famous LNER Class A3 4472 Flying Scotsman, which has been overhauled in the Museum. Although noted for its Medieval history, visitors can also gain an understanding of the Cold War through visiting the York Cold War Bunker, former headquarters of No 20 Group of the Royal Observer Corps. The city's first subscription library opened in 1794. The first free public library, the York Library, was built on Clifford Street in 1893, to mark Queen Victoria's jubilee. A new building was erected on Museum Street in 1927, and this is still the library today; it was extended in 1934 and 1938. Higher and further education The University of York's main campus is on the southern edge of the city at Heslington. The Department of Archaeology and the graduate Centres for Eighteenth Century Studies and Medieval Studies are located in the historic King's Manor in the city centre. It was York's only institution with university status until 2006, when the more centrally located York St John University, formerly an autonomous college of the University of Leeds, attained full university status. The city formerly hosted a branch of the University of Law before it moved to Leeds. The University of York also has a medical school, Hull York Medical School. The city has two major further education institutions. York College is an amalgamation of York Technical College and York Sixth Form