Photograph of the city hall (Rathaus) of Bonn, presumably the way it looked when Carl Schurz and other University of Bonn students were visiting it in 1848.
Unknown author<span style="display: none;">Unknown author</span>
published 1907
<i>Reminiscences of Carl Schurz</i>, Vol. I, New York:  McClure Publ. Co., 1907, Chap. 4, facing p. 94.