This week, we're exploring some of Paris's department stores or "Grands Magasins". These monuments to shopping have been in business since the mid-to-late 18th century and are internationally renowned. But the entire shopping experience is the result of a lot of hard work by large numbers of people. Our team spent 24 hours behind the scenes at the Printemps store. We also met Frank Rosenthal, a retail expert, to find out more about how the "Grands Magasins" have remained such important institutions over the decades.