The term "supermarket" doesn't begin to describe the recently revamped "El Ninot" market in the heart of Barcelona. mateo arquitectura, who helmed the redesign, kept the basilica-like interior intact while digging out two new floors for additional parking, storage, and shopping space. The massive open-air volume keeps the market naturally-ventilated but its ample windows risked a greenhouse-effect from the sunlight. The architects tackled this with sleek metals shades that line the exterior. That's not the only modern addition: the ground floor sports retractable metal doors that make closing shop at night a breeze for vendors.