Goat Cave Karst Nature Preserve reveals a side of Austin hiding beneath the limestone. A short, quiet trail winds past sinkholes, cave entrances, and interpretive signs explaining the fragile karst landscape that shapes the city’s springs and aquifer. The caves themselves require a guided program to enter, but the surface walk still feels like a miniature geological expedition. Parking is limited, and dogs and bikes are not allowed, so arrive ready for a gentle, leave-no-trace hike.