W. C. Child Ranch, near Helena, Montana, ca. 1890,* from an Historic American Building Survey (HABS), via Library of Congress Prints and Photographs Division.
Mr. Child became rich from prospecting in Montana. He built this octagonal house on his 3,000-acre ranch in the late 1880s.
However, he used it not as a home, but as a party space. (The whole second floor was a ballroom.) He and his friends — sometimes over 100 — would take the Northern Pacific train from nearby Helena for banquets and dances lasting late into the night.
By 1893, Child was broke and had to assign the ranch to another man. He was found dead in the house a month later.
The house and barn still exist as a special events center called Kleffner Ranch. *Both HABS pictures here were photocopies of original photographs; the originals are in the collection of the Historical Society of Montana.