Tate Modern is a modern art gallery located in London. It is Britain's national gallery of international modern art and forms part of the Tate group (together with Tate Britain, Tate Liverpool, Tate St Ives and Tate Online). It is based in the former Bankside Power Station, in the Bankside area of the London Borough of Southwark. Tate holds the national collection of British art from 1900 to the present day and international modern and contemporary art. Tate Modern is one of the largest museums of modern and contemporary art in the world. As with the UK's other national galleries and museums, there is no admission charge for access to the collection displays, which take up the majority of the gallery space, while tickets must be purchased for the major temporary exhibitions.HistoryBankside Power StationTate Modern is housed in the former Bankside Power Station, which was originally designed by Sir Giles Gilbert Scott, the architect of Battersea Power Station, and built in two stages between 1947 and 1963. It is directly across the river from St Paul's Cathedral. The power station closed in 1981.Prior to redevelopment, the power station was a 200m long, steel framed, brick clad building with a substantial central chimney standing 99m. The structure was roughly divided into three main areas each running east-west - the huge main turbine hall in the centre, with the boiler house to the north and the switch house to the south.