On our drive from northern MN to Traverse City, MI we stopped at Iron Mountain, MI and took in the Iron Mountain Mine tour. It was a fairly short tour by electric mine rail car and about 400 meters of walking. We were a few hundred feet down. It was about 44 degrees inside the mine and there were some bats which fluttered around our heads at times. Our guide taught as how the mine workers in the mid-1800s to the early to mid-1900s dug out the iron ore.