The Highlands Ranch Mansion is described as being haunted by the ghost of a girl named Julia Kistler, with various unexplained phenomena reported, including unexplained smells of rose perfume, disembodied voices and whistles, and sightings of a little boy and girl's faces at the windows. People have also described seeing Julia's silhouetted figure and hearing her sobbing. Staff and visitors report hearing unexplained whistles, a female voice that appears to come from nowhere, and the scent of rose perfume that has no source. Items in rooms that no one has entered have been found moved to different locations. Reports include the sighting of a little boy and a little girl's faces pressed against a window, and the silhouetted figure of Julia Kistler herself. Beyond disembodied voices and whistles, some have reported hearing Julia sobbing. Many of the reported hauntings are attributed to the ghost of Julia Kistler, the daughter of a family who purchased the mansion in the 1920s.