Designed by Graham, Anderson, Probst & White, Chicago Union Station is one of the last grand American railroad stations. When it opened in 1925 it was considered an outstanding achievement in railroad facility planning. The limestone-clad structure has an austere Neoclassical exterior with a massive colonnade on the east side. The interior features a Beaux Arts-style Great Hall, a marble-sheathed waiting room enclosed by colossal fluted Corinthian columns with gilded capitals.