Bonne Terre Mine, Bonne Terre
The old Bonne Terre Mines is worth a visit just to see the lake. The mines are massive with rock formations everywhere from the water. The lake has unbelievable visibility of at least 150 ft. They have underground pontoon boats that you can go on a tour of the various chambers in the mines and if you're a diver, it's rated as one of National Geographics top ten dive destinations.