The Lincoln Park Zoo is rumored to be haunted because it was built on part of the Chicago City Cemetery, a large burial ground. Some ghostly phenomena reported by visitors and staff include figures in Victorian clothing appearing and vanishing quickly, flickering lights, and doors slamming on their own, particularly in areas like the Lion House. The zoo is built over the former site of Chicago City Cemetery, which was a large burial ground at the edge of Lake Michigan. After cholera outbreaks, residents sought to remove the cemetery, and parts of it were built over by the growing city, including the area where the zoo stands today. Some accounts describe seeing ghosts dressed in Victorian-era clothing. Other reported occurrences include lights flickering and doors that slam shut on their own. The Lion House is often mentioned as a site where these ghostly activities are observed.