The entire Wisconsin Historical Society Library was housed in this bookcase in 1853. It is currently located on the second floor of the library near the circulation desk. It has been described as the “Holy Grail” of Wisconsin library artifacts. The WHS Library has grown from this small beginning to be one of the world’s greatest historical libraries. Few libraries have preserved an artifact that is as significant to its history as is this bookcase to the WHS Library. What is the most historically significant artifact that has been preserved by your library? The WHS Library is included on the Wisconsin Library Heritage Trail.