Migrant workers from Afghanistan work 12 hours a day at the 'Brick Kiln' in Isfahan, Iran. From tractors to wheelbarrows, they also transport bricks to the furnaces. /VCG Photo

The picture shows the bricks being stacked up awaiting collection, while raw bricks are hauled down to a nearby furnace - where they are baked 100,000 at a time. /VCG Photo