Mount Madonna County Park is considered haunted primarily by the ghost of Sarah Miller, the daughter of the former owner, Henry Miller. Sarah died at a young age in the park after a horse-riding accident around 1879. Her alleged haunting is linked to the ruins of her family's former mansion, and reported paranormal activity includes sightings around the ruins, mysterious footprints, and screams from campers. Sarah Miller died at a young age, believed to be eight years old, after a tragic horse-riding accident in the area that is now the park. Some accounts say she fell and broke her neck, while others say her horse fell on her. Despite her body's eventual relocation, her spirit is said to remain on the mountain, making it a place of paranormal interest. Ruins of the Mansion: The ruins of the Henry Miller mansion, where Sarah spent summers, are believed to be haunted. Visitors and ghost hunters explore these remnants, looking for signs of Sarah, especially around the stone walls and staircases. Park rangers and visitors have reported hearing unexplained screams. Campers have found horse tracks and human footprints circling their tents, particularly at night. The park's natural fog can add to the mysterious and eerie atmosphere. Sarah's young death is the central point of the haunting. The park itself was once the summer retreat of Henry Miller, a prominent figure known as the "cattle king," adding a layer of historical significance to the site.