The Octagon House in Fond du Lac, WI, is known for reported paranormal activity, including feelings of a presence, apparitions of Ruth Pier, a woman believed to be the wife of the original owner's son, strange noises like footsteps and voices, and unexplained cold sensations. These experiences are often tied to the house's history of secret passageways, including a fake fireplace leading to a stairway and a hidden room. Some visitors and residents have claimed to see the ghost of Ruth Pier. People have reported feeling touched, a sense of intense cold, hearing footsteps, and experiencing a general feeling of being watched. Unexplained voices and children's laughter have also been reported. The house was built in 1856 by Isaac Brown, and it contains several secret spaces and hidden passages, including a false fireplace that hides a wooden stairway. There is also a secret room adjacent to a second-story bedroom. A cryptic message carved into the lath of the house may provide directions to a secret meeting.