Natural Bridge Caverns are a very interesting spot to stop. They are half way between New Braunfels and San Antonio. We went on an hour and a half tour of the caverns and went down 180 feet below ground. It was very warm and moist down there. This is one of very few "live" caverns which are still in the process of growing stalagmites and stalactites. It takes 100 years for them to grow one inch, so you can imagine the millions of years this cave has been growing to look as it does now. Pictures do not do the experience justice. The second picture is of a "fried egg" stalagmite. The different crystals being deposited and the wettness in the middle give it a yellow in the middle look and white on the outside. This is well worth the stop.