By Milo Boyd A largely abandoned theme park in China is fighting for the title of worst in the world, according to some unhappy visitors. The Shijingshan Amusement Park in Beijing gives the impression of being shut, yet it is very much open for business today. It is an unusual place that has enjoyed very few updates since it was built in the 1980s. The general feeling of the park is one of decay and desertion. Videos from the site show great tracts of emptiness between rides, with very few punters on hand to offer the place any energy. On the wall the paint is crumbly and flaking, while great …