This unique rock home is famous as the "Castle on the Prairie." Built in 1901, this was the home and office of pioneer doctor, Thomas F. Renfrow, who took part in the 1893 Cherokee Strip Land Run and settled in Billings in 1899.

The two-story rock home features a metal-domed roof, detailed trim and a hexagon-like exterior, along with eight rooms, four rock chimneys, 10-foot ceilings and massive arched windows with tinted glass. This home has few characteristics of frontier homes built prior to Oklahoma statehood. The home, with its unusual Richardsonian Romanesque architecture, is listed on the National Register of Historic Places. Donations welcomed; admission fee applies for tour groups. Guided tours by appointment only.