CUSTER, S.D. (KELO) — Back in the 1950s, Jewel Cave was looked at as a small cave at only around two miles long. Today, it’s known to be more than 217 miles long, which means it ranks as the 5th longest cave in the world. “I wonder if they’re just…Read More
5th Longest Cave in the World Turns 115 Jewel Cave National Monument
