Soudan Underground Mine State Park is located in Minnesota and features the historic Soudan Underground Mine, which was the state's first iron ore mine. Visitors can explore the mine through guided tours that take them 2,341 feet underground, where they can learn about mining history and geology. The park also offers various outdoor activities, including hiking and picnicking, with scenic views of the surrounding area. It is home to diverse wildlife and unique geological formations, making it a popular destination for nature enthusiasts and history buffs alike.