Alaska’s Wrangell-St. Elias National Park and Preserve is the largest tract of land under the National Park Service’s jurisdiction. Despite being so massive, this national park is still not very well known, and there are many fascinating places to explore without fighting crowds. You could go a long time hiking through the mountains and forests of this wilderness without coming across anything made by human hands – but you might stumble upon a ghost town: The Kennecott Mines National Historic Landmark.