Today it's a museum on the National Register of Historic Places for Minnesotans to learn about the lumbering industry, Civil War, and the Old Stillwater Prison. Back in the day, the Warden's House was the residence of the Minnesota Territorial Prison warden.
Built in 1853, thirteen wardens resided in the home until 1914 when the prison moved to Bayport. Warden Henry Wolfer (pictured below), who was the last warden to live in the home, had a daughter named Gertrude whose spirit is said to be living at the Warden's House still today.
According to Haunted Rooms, Gertrude died of appendicitis after giving birth to a baby boy. The boy was sent to live with Henry until the Wolfers moved out of the home in 1914.
There have been consistent reports of a woman wandering throughout the home. She's been seen looking out the windows, and at times a cradle in an upstairs bedroom rocks on its own.