The main attraction at the O'Fallon Historical Museum is "Steer Montana." A Roan Polled Shorthorn Breed, born on March 23, 1923, he lived 15 years and 4 months. Steer Montana grew to be the largest bovine animal in the world, a record which still stands. He stood 5 feet 11 inches high, 10 feet 4 inches long, 9 feet 2 inches in girth and achieved a certified weight of 3980 pounds.
The museum is behind the city and county building in Baker.