AAA Texas Explorer: Venture farther into the depths of Natural Bridge Caverns, wandering passageways never before accessible to the public. The new Hidden Wonders Tour takes visitors 1,100 feet deeper into Hidden Cavern, one of the caves at this popular attraction about 30 miles northeast of downtown San Antonio. Explore spaces that were sealed for thousands of years, secreting delicate rock formations—some more than 180 feet below ground.