"The grandstand for Madrid's Hipodrómo de La Zarzuela (the city's horse racetrack) is Eduardo Torroja's masterpiece and one of Spain's most important architectural works of the 1930s. The building complex was... designed by the architectural office of Carlos Arniches and Martín Domínguez in collaboration with internationally well-known civil engineer Eduardo Torroja, who with Robert Maillard, Eugene Freyssenet, and is considered a pioneer in the design of concrete structures. The Grandstand for La Zarzuela Racetrack is the best-known work of Arniches and Domínguez, as well as Torroja's most important architectural work—among many other brilliant structures that he conceived—to the point that it is credited only to him."