The Keystone School, on 3rd St. in Keystone, South Dakota, was listed on the National Register of Historic Places in 1981.
It is a large rural school built 1897-1900 by Eli Shomaker, with roof of wood shingles. With
In 2018, it has been the Keystone Historical Museum for a number of years.
References
External links Keystone Historical Museum, official site