There used to be tours of the Detroit Salt Mines, and indeed the Detroit Salt Company is still alive today.
Near the "Uniroyal Giant Tire" [1] off of I-94 is a small tunnel that goes under the freeway. Not the same as these, but, well, as interesting as the freeway tunnel I suppose.
Near the "Uniroyal Giant Tire" [1] off of I-94 is a small tunnel that goes under the freeway. Not the same as these, but, well, as interesting as the freeway tunnel I suppose.
[1] https://www.google.com/maps/place/The+Uniroyal+Tire/@42.2714...