The Croke-Patterson Mansion is known for a variety of haunting phenomena, including apparitions of a woman and child, phantom sounds like children's cries and dog barks, poltergeist activity with objects moving and tools disappearing, and a dark specter in the basement. Stories include a woman who committed suicide after losing her baby and two guard dogs that mysteriously died after jumping from the third-floor turret. These alleged occurrences have led to the mansion being called one of Denver's most haunted buildings, even appearing on TV shows like Ghost Hunters. Visitors report seeing a ghostly figure of a young woman and a small girl, as well as dark specters in the basement. Disembodied voices, children's cries, and the barks of two guard dogs are heard throughout the house. Typewriters and other office equipment have been reported to start on their own, and tools have gone missing during renovation. Guests have experienced objects moving through rooms and sudden, loud noises from apparently empty areas. The most famous story involves two guard dogs who were found dead on the lawn, having either jumped or been pushed from the third-story turret. A significant haunting involves the spirit of a woman who committed suicide in the house after the mysterious death of her infant. The spirit of Katherine Patterson, the wife of a former resident, is said to show her disapproval by turning lights on and off in a specific room when unmarried couples are staying there. While the mansion is famed for its hauntings, some believe the true history of the building, built in 1891, is more significant.