Visit and feel the splendor of the 1890 Victorian Schoolhouse in Keystone! Keystone was developed through the gold rush of the late 1890's. The Historical Keystone Museum houses displays of local Keystone history including mining and the making of Mt Rushmore collectibles. It also houses the collectibles of Carrie Ingalls of "Little House on the Prairie" fame. She lived most of her adult life in Keystone. The museum is free. The Keystone Historical Society manages the museum and the Keystone Historical Walking Tour with 21 sign sites throughout the community of Keystone. The walking tour is also free. Brochures available at the Chamber.