Spanish architects win prestigious category award at World Architecture Festival . The jury of the International Federation of Architectural Critics awarded them a gold medal for their work in the city of Barcelona. Millions of tons of rubbish was dumped at the site near Barcelona for 30 years . Water from site purified for use in irrigation , bio gas used to create electricity .
Spanish architects win prestigious category award at World Architecture Festival . `` La Vall d'en Joan '' project turned rubbish dump into architectural landscape . Millions of tons of rubbish was dumped at the site near Barcelona for 30 years . Water from site purified for use in irrigation , bio gas used to create electricity .