Go down in history with a tour of the Hill Annex Iron Mine. On the 1 1/2-hour open pit mine tour, visitors make a spectacular descent into mining's past. Learn about the mine operation, the people who worked here, and where they came from. Discover marine fossils in northern Minnesota. Get a sense of the mine's deep, rich history. Learn how this National Historic Site played an important role in state, national, and world history.