Fodor's Expert Review Natural Entrance

As natural daylight recedes, a self-guided, paved trail twists and turns downward from the yawning mouth of the main cavern, about 100 yards east of the visitor center. The route is winding and sometimes slick from water seepage aboveground. A steep descent of about 750 feet, much of it secured by hand rails, takes you about a mile through the main corridor and past dramatic features such as the Bat Cave and the Boneyard. (Despite its eerie name, the formations here don't look much like femurs and fibulae; they're more like spongy bone insides.) Iceberg Rock is a massive boulder that dropped from the cave ceiling millennia ago. After about a mile, you'll link up underground with the Big Room Trail and can return to the surface via elevator or by hiking back out. Footware with a good grip is recommended.