 The Canonsburg Armory, Hawthorne School and Roberts House are listed on the National Register of Historic Places.The Standard Chemical Company operated a radium refining mill from 1911 to 1922 on a plot of land.From 1930 to 1942 the company purified uranium ore. Marie Curie was invited to the United States in 1921 and was given an honorary degree by the University of Pittsburgh, and one gram of radium.