Great Falls - C. M. Russell Museum
Charles M. Russell (1864-1926) was a painter of Western scenes of the U.S. These included cownboys and other white settlers, Indians, and landscapes. He created over 2,000 paintings. He lived most of his adult life in Great Falls, Montana. The C. M. Russell Museum has the largest collection of his works.
I believe that the objects on the roof are elk antlers. Russell's home / studio was moved to a location next to the museum.