Within the cavern itself you can see many different Diamond Cascade formations, Bacon formations, the Rainbow lake, and the Capitol dome. The caverns themselves are apart of the potomatic system, and owe there formation to the Potomac river. The river and the rain move into cracks in the rock and dissolve away the limestone and dolomite overtime, leaving behind a variety of cave systems that are supported by the less soluble rock. The remaining water in the caves form the structures found within. They generally consist of calcium carbonate dripping from the ceilings. These formations are known as speleotherms. The Diamond cascade's calcium carbonate has the addition of calcite crystal which makes the formation sparkle. The Bacon formations are a type of flowstone calcite that has stripes of different colors within which give it it's bacon like