The Douglas Monument Association was organized in 1861 to build a suitable memorial at the gravesite. In 1864 the Association adopted the design of Illinois sculptor Leonard W. Volk. Construction of the 96-foot-tall granite structure was begun in 1866 and completed in 1881 Three circular bases are topped by a 20-foot diameter octagonal mausoleum. Inside, a Vermont marble sarcophagus holds Douglas’ remains, surmounted by a marble bust of the Senator. At the four main corners of the mausoleum, pedestals hold large bronze allegorical figures portraying “Illinois,” “History,” “Justice,” and “Eloquence.” Above the main base of the column are four bronze bas reliefs representing stages in “the advance of American civilization.” Atop the 46-foot column is a nine-foot bronze statue of Douglas gazing over Lake Michigan. The grounds surrounding the Tomb are landscaped with numerous trees and flower beds.