Spanish architects win prestigious category award at World Architecture Festival . ` ` La Casa d'en Casa '' project turned rubbish dump into architectural landscape . LONDON , England ( CNN ) -- Millions of tons of rubbish was dumped at the site near Barcelona for 30 years . Water from site used for use in irrigation , and gas used to create electricity .
Spanish architects win prestigious category award at World Architecture Festival . ` ` La Casa d'en Casa '' 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 used for use in irrigation , and gas used to create electricity .