The Qasr Al Hokm Downtown Metro Station, at the heart of Riyadh, is designed as an urban plaza with a large curved stainless steel canopy with a dual function: channeling daylight into the subway station and visually connecting – thanks to the polished stainless steel dressing the volumes – the exterior and the interior atrium. Furthermore, this huge canopy functions as an urban landmark signaling the station’s entrance. The metro station’s design is sustainable on multiple levels: environmentally sustainable in providing energy, water conservation, daylight harvesting, natural shading, ventilation, and economically sustainable in providing an efficient public transport hub in a densely populated city to reduce traffic congestion. Above all, the design is socially sustainable, providing a vibrant public space for the citizens of Riyadh. A lush garden occupies the base of the atrium; a striking element in the design because the underground garden serves as a pleasant waiting platform and link between the two metro lines. This garden receives sunlight that is supplied to the underground lighting system through optic fiber mechanisms, illuminating the space with no need for energy, and without heating up the building.