New York's Pennsylvania Station represents the busiest train station in North America, with 300,000 passengers per day. The station building itself, built in 1910, has also had a bustling life. The massive Neoclassical station concealed a filigree structure inside that allowed for perfect illumination of the departure platforms. In 1963, the station was demolished, the railway hub moved underground, and Madison Square Garden with a pair of administrative buildings rose in its place. Traveling from Penn Station became a nightmare. The station has survived in makeshift conditions for decades, but now there is hope that the famous Madison Square Garden could be replaced by a station complemented by essential commercial functions. The Municipal Art Society commissioned four New York firms: Shop Architects, SOM, H3 Hardy, and Diller Scofidio + Renfro to revive public discussion. The architects were given no limits in their creation. The most daring approach to the project was taken by SOM, which spread a massive platform with a funnel-shaped rooftop garden among the quartet of skyscrapers. The cosmic dome-shaped form, with a diameter of one hundred meters, allows sunlight to penetrate into the station hidden deep underground.