One of the many exposed steam tunnels, unearthed by erosion and broken into by farm tractors and bored kids.
A light-painted portrait of one of the few remaining carts that moved everything from fresh eggs to soiled laundry through the tunnels.
Past the underground repair shop is this cliffside adit.
This tunnel goes to the adit over the Eagle River Mills. I bet those carts go fast down here!
A high-voltage tunnel sheathed in concrete dips below ground near a shell packing building that now stores fireworks.
A tunnel that brought heat from the power plant to the Hart House. Since that building was demolished, this only served as a fallout shelter. To my knowledge, this was never used to move bodies to the incinerator. That was probably done with a vehicle and the lower entrance to the power station, which did dispose of TB victims for some time.
The left tunnel goes to the opposite side of the car elevator seen on the right. There was a time when Fords were shipped by barge on the Mississippi. This freight elevator brought them from the assembly floor to river level. A separate elevator was for moving men and silica up and down.
A ruined culvert near Oregon Creek, behind Old Main, the predecessor of the University of Minnesota-Duluth.