Powerful meltwater drilled enormous cylindrical potholes into basalt along the St. Croix River. A concentrated cluster beside the park's trails lets visitors stand among some of the deepest and most dramatic glacial potholes in the region.
Filed under roadside oddities: giant objects, odd monuments and things built for no clear reason.
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Source: dnr.state.mn.us/state_parks/virtual_tour/interstate/dialup.html