In the dank depths of Ellison’s Cave, you can find two of the deepest freefall pits in mainland US: Fantastic Pit, which plunges vertically for 179 meters (586 feet); and Incredible Pit, an equally dizzying 134 meters (440 feet) deep. Ellison’s Cave is located on Pigeon Mountain among the Appalachian Plateaus of Northwest Georgia. The entire cave system is around 19 kilometers (12 miles) long and 324 meters (1,063 feet) deep, making it the 12th deepest cave in the country. Its vertical pits, just like most caves, are formed via erosion by water over thousands upon thousands of years. Rainwater…