High Fens – Eifel Nature Park is a 959-square-mile park shared between Germany and Belgium that is pretty much left to nature. The natural landscape is home to an incredible diversity of flora and fauna, upland moor, reservoirs, deep valleys, forested mountainsides, and 1,000-year-old caves. The park has been restored and re-colonized by rare species of plants and animals that originally lived in the habitat. Visitors might be able to see the starling-sized dipper, roe deer, fox, wildcats and, in the spring, the rare violet copper butterfly, which lives in the daffodil-filled glades by the river. The park is intersected by many trails and the staff offer guided tours.