Share article to An imposing three-story tower at the center of Spruce Tree House may have served to unify the two social groups that seem to have occupied the dwelling. Location: Mesa Verde National ParkPlace: Four CornersMap: Image by: Borchert, Andreas F. Date: 2006Source: File:Mesa Verde National Park Spruce Tree House Three Storeyed House 2006 09 ...Copyright Notes: Image courtesy of Wikimedia Commons.