Doncaster is a minster town in South Yorkshire, England. Named after the River Don on which it lies, it is the administrative centre of the greater Metropolitan Borough of Doncaster. It is the second largest settlement in South Yorkshire, after Sheffield. In addition to the city of Doncaster, the boroughs include the towns of Conisbrough, Mexborough, Bentley, Adwick-le-Street and Thorne, rural villages and open nation-state areas. Based on the help of Roma, Doncaster is a nearby central hub with precise delivery links, monuments and entertainment centres. It has long been considered a market town due to its large market centre and its market composition. Unique visiting places are here in the City of Doncaster, including Mansion House, Doncaster, Doncaster Museum and Art Gallery, Potteric Carr Nature Reserve, Ashworth Barracks, Cusworth Hall, Conisbrough Castle, Brodsworth Hall and Gardens.