Built in 1896 as Great Falls High School, the Paris Gibson Square Museum of Art building was named for the founder of Great Falls. Paris Gibson was a prominent businessman who saw hydroelectric potential in the series of waterfalls on the Missouri River that the city shares its name with.
The museum opened in 1977, and is reputed to be haunted. The phenomena experienced have included the sounds of children in the halls and the ghost of a girl in the basement.
Mark Beré Peterson: Hauntings, Urban Legends, History, Folklore, Mythology and Witchcraft 