Natural Bridge Caverns

Lonely Planet review

About halfway between San Antonio and New Braunfels, this national landmark cave is one of the state’s largest underground formations. Its name comes from the 60ft natural limestone bridge that spans the entrance. Inside (where it’s always 70°F/21°C) are simply phenomenal formations, including the Watchtower, a 50ft pedestal that looks like a crystallized flower.

You can only see the caverns as part of a guided tour, which includes the family-friendly Discovery Tour, the Hidden Passages Illuminations Tour, or the more challenging Adventure Tours. Attached is the Natural Caverns Wildlife Park, a small zoo with rare animals.