The Trafford Training Centre (currently known as the AON Training Complex for sponsorship reasons and usually referred to as Carrington) is the sports training facility and academy headquarters of English football club Manchester United F.C. It is located near the village of Carrington in Greater Manchester. The centre replaced The Cliff as the club's training ground in 2000. Construction on the complex began in 1999, the main building was opened and the first team moved in in 2000, followed in 2002 by the Academy facility, home to the club's renowned youth system. In 2013, major additions were completed at the complex, including a medical centre and sports science department, bringing the total construction cost of the training complex to over £60 million. The complex is regarded as one of the premier training facilities in world football, and is noted for its secrecy, security measures and use of cutting-edge modern technology.