Architect Barton Willmore and civil engineer Buro Happold have won a competition to design a futuristic botanical garden and leisure centre in Saudi Arabia.

The $170m (£82m) 160ha King Abdullah International Gardens are due to be completed by 2010. At the centre is a building, formed as two interlocking crescents, that accommodates controlled environments. Run mainly on solar power, the development will be supported by wind turbines.