Sutton has the largest library in the borough, several works of public art and four conservation areas. It is home to several large international companies and the sixth most important shopping area in London, centred on Sutton High Street. Sutton railway station is the borough's largest, with frequent services to central London and other destinations, including Horsham. Sutton is a hub for filming in South London. It is home to the Royal Marsden Hospital and the Institute of Cancer Research, where there are plans to create the world's second biggest cancer research campus.