Natural Bridge Caverns -- we went there to see what interesting they offer inside :) Unlike caves in Perm they keep it lit all day long but they have three doors to keep the moisture in I was amazed that my cam did not short out -- it was so moist as if you are in a sauna. Touching anything is strictly prohibited (except for one stalactite specifically designated for touching, and all black and dirty) as oils from our fingers react with stalactites/stalagmites and stop them from growing further. All water in the cave is very pure, due to filtering through the limestone. The deepest point of the caverns is 230 feet. Some more facts can be found here