The first tour of the day. Explore the Natural Bridge Caverns Discovery Passages illuminated only by the light of your cave lantern, just like the original discoverers did decades ago. Travel down the winding passages of this San Antonio attraction and be amazed how the incredible and rare formations of the cavern reveal themselves in room after dazzling room. Towering stone monuments. Glistening, delicate soda straws. Waves of colorful cave ribbons. Youll feel like youre one of the first people to experience Texas largest and most spectacular underground cavern. The tour is only offered at 9am. Tour duration: 75 minutes; Walking distance: 3/4 mile. Fee: 12 and older $24.99; ages 3-11 $14.99. Open daily except Thanksgiving; Christmas and New Years Day. Fee