If you're looking for something a little off the beaten path, you can't go anymore obscure than this amusement park for the eyes underneath the earth. This natural phenomenon made up of 140 million-year-old rock formations is one of the top attractions in Texas and offers a great opportunity for kids to learn and have fun simultaneously. You can explore this beautiful and historical cavern system by the light of a cave lantern, pan for precious stones, take a leap of faith from the Canopy Challenge, go caving on one of their many adventure tours or at the very least enjoy nature on the original Discovery Tour.