Crown Hall George Herbert Jones Laboratory Morrow Plots Old Main, Knox College Principia College Historic District University of Illinois Observatory Iowa Iowa Old Capitol Building Massachusetts Massachusetts Hall, Harvard University Memorial Hall (Harvard University) Old Harvard Yard Sever Hall University Hall (Harvard University) Mississippi Oakland Memorial Chapel Missouri Sanborn Field and Soil Erosion Plots Westminster College Gymnasium New Jersey Joseph Henry House, Princeton University Nassau Hall, Princeton University President's House (Princeton), Princeton University Princeton Battlefield, Princeton University Prospect (Princeton), Princeton University New York New York State (excluding NYC) W. & L. E. Gurley Building Morrill Hall Main Building (Vassar College) Vassar College Observatory Nott Memorial Hall Elihu Root House United States Military Academy New York City only Cooper Union Low Memorial Library Philosophy Hall Pupin Hall Founder's Hall, The Rockefeller University Ohio Cincinnati Observatory Pennsylvania Old West, Dickinson College Grey Towers Castle M. Carey Thomas Library South Carolina Chappelle Administration Building, Allen University Fort Hill, Clemson University College of Charleston Historic District, College of Charleston West Virginia Old Main, Bethany College Alexander Campbell Mansion References Colleges and universities