"Stretching for more than 3,000 acres across the Niangua arm of the Lake of the Ozarks, Ha Ha Tonka State Park is a geologic wonder, offering 15 miles of hiking trails amid soaring bluffs, sinkholes, caves, a natural bridge, and Missouri’s 12th-largest spring. The park’s most impressive attraction, however, is its European-style stone castle, built by a wealthy businessman in 1905 as a family summer home. The structure also served as a hotel before falling into ruins, which now loom eerily above the lake and Ha Ha Tonka Spring. Access the site via the park’s series of trails and boardwalks, then explore the surrounding wooded areas and open rocky glades. When you’ve had enough adventure, settle at one of the many picnic sites for lunch in a spectacular setting."