1. The Devils Kettle In Minnesota
There is a river in Minnesota called the Brule River. This river flow splits along a rock crop. One-half of the river continues on flowing to Lake Superior, but the other half remains a mystery. They enter through a rock hole and seemingly vanish. The assumption made for the other half is that this water flow enters a web of underground caves and travels through a lot of channels before eventually joining the river. The theory hasn’t been proved yet because there has been no proof. Scientists have experimented with this water flow by using dye to see which part of the lake ends up with colored water. They even tried putting ping pong balls in the water to see if it comes up from somewhere. So far, the results have been quite futile giving the rise to the name Devils Kettle.