1.   At the end of the tunnel, visitors pass through a smaller third door that leads to trails for viewing cave formations.

2.   For example, there are odd cave formations that have long been known by cavers but are only now being identified as products of living microbes.

3.   In color photographs and text, Pittman covers the basics of Texas caves and cave formations.

4.   Our goal was the striking cave rock formations known as the Miracle Bridges.

5.   The cave featured interesting formations pointed out by a guide, who demonstrated convincingly why one must never touch the cave formations.