Spanning 350 acres across Flathead Lake, Cromwell Island is a private oasis in the Montana wilderness. The property offers 3 miles of shoreline in the largest freshwater lake west of the Mississippi River and affords direct views of the Mission Mountains. It comes with a 45,000-square-foot residence with a terra-cotta roof, mahogany windows, and a concrete facade made to look like Montana Travertine. Its interior has been left unfinished and can be completed to the new owner's liking. The property also includes a two-bedroom guest house, an underground shooting range, and a boat dock with five slips.