Minoru Yamasaki, architect of the Northwestern National Life Building in Minneapolis and of the original New York World Trade Center, designed five buildings at Carleton in the 1960s. Olin Hall of Science (1961) has a distinctive "radiator" grill work on the exterior. Goodhue (1962) and Watson (1966) Halls were built as dormitories. At seven floors, Watson is the tallest building on campus. The West Gym (1964) and Cowling Gym (1965) were built to replace Sayles-Hill for indoor athletic facilities, originally for men and women respectively.