High Quality Content by WIKIPEDIA articles! The Winchester Mystery House is a well-known mansion in California. It once was the personal residence of Sarah Winchester, the widow of gun magnate William Wirt Winchester. It was continuously under construction for 38 years and is reported to be haunted. It now serves as a tourist attraction. Under Winchester`s day-to-day guidance, its "from-the-ground-up" construction proceeded around the clock, without interruption, from 1884 until her death on September 5, 1922, at which time work immediately ceased. The cost for such constant building has been estimated at about US $5.5 million (if paid in 1922; this would be equivalent to over $71 million in 2010).