Octagon House (Fond du Lac, Wisconsin)

[2] Isaac Brown, a carpenter and trader with Native Americans, reportedly grew fearful of attacks from them in 1856, so he built a house that was designed for hiding.

[2][3] A small storage room beneath the front porch was supposedly used to hide the runaway slaves.

Despite the house being on the National Register of Historic Places, no buyers were interested and it was days away from demolition.

Local dressmaker and antiques dealer Marlene Hansen bought the house without viewing the interior.

"[2] Her grandson, who often gives tours of the house, has said that visitors have reported hearing sounds, including small children laughing and playing, and feeling cold hands touching them.