Greg Brick goes places you don't know exist. He delves in sewer lines, tunnels, catacombs and the likes of the Wabasha city caves in St. Paul. He is not urging you to go there.
The caves are a large network that lie across from the Mississippi in downtown St. Paul and extend for miles along the river. They are man made, dug in 1840 to mine silica to make glass.
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