If there is one Minnesota state park that breaks the mold its probably Blue Mounds near Luverne. While most Minnesota parks are tree-covered, Blue Mounds is mainly open prairie. In a state famous for its natural lakes, Blue Mounds' only lake is manmade. But visitors say those differences are the park's strengths. It's a storehouse of rare plants and animals, touched by a hint of mystery. Mainstreet Radio's Mark Steil reports: