Guanzhou is building itself a clock tower, twice the size of Big Ben. When it is finally installed at the end of June it will be the world’s largest mechanical clock with four 13 metres diameter faces with minute hands 7.8 metres long. The clock was made in England by the family firm Smith of Derby, also responsible for timepieces in St Pancras station and St Paul's Cathedral. The tower will include a viewing gallery so visitors can inspect the movement. It will be opened to the public next year.