Q:Millville Illinois - Millville is a defunct settlement in Jo Daviess County Illinois United States located within the boundaries of Apple River Canyon State Park. Founded in 1835 and platted in 1846 the community was washed away completely by a flood in 1892. No visible remnants of its structures remain today. The site of Millville was added to the U.S. National Register of Historic Places as the Millville Town Site in 2003. Given a choice of categories company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work, the text refers to which one?
A:
Building