Jewel Cave NP

This park is a must see if you like caves. While tourist accessible areas are limited this is a large cave consisting of over 160 miles underground. It has some of the best and varied formations found underground. I rate it better than Mammoth and equal to Carlsbad. Nailhead, popcorn, stalactites, stalagmites, boxwork,frostwork, ribbons, curtains, and soda straws are all present.