The Mark Twain House in Hartford is known for reports of paranormal activity, including phantom cigar smoke, unexplained noises, and apparitions of women and children. Visitors and staff have described cold spots, hearing voices or footsteps, and feeling tugs on their clothes. The spirit of Twain's daughter, Susy, is often mentioned as a presence in the house, and the house itself is a popular destination for ghost tours. People have reported seeing figures, including a woman in a white dress and possibly a child. Unexplained footsteps, loud bangs, and voices have been reported. Lingering cigar smoke, a signature for Mark Twain, and floral perfumes have been detected. Visitors have felt tugs on their clothing or heard strange noises, such as the fire alarm sounding with no cause. Some report feeling a presence, cold spots, or experiencing fleeting moments out of the corner of their eye. Potential Spirits: Mark Twain: The persistent smell of cigar smoke in his billiard room is often attributed to him. Twain's daughter, Susy, who died tragically in the house, is believed by many to be a lingering spirit, according to The Dead History and Reddit. The Butler: The family's butler, George Griffin, is also said to make his presence known through knocking sounds. Twain himself was interested in spiritualism and dreams, a fact explored on the popular ghost tours, according to YouTube. The house is a meticulously restored National Historic Landmark and a place where the author and his family spent many years, leading to a rich history that fuels the haunting stories, notes the Mark Twain House.