In 1960 four students from St. Mary’s University, in San Antonio, were caving in Comal County when one of the boys felt an unexpected draft. A crawl through a narrow corridor led them to a network of caverns filled with breathtaking formations, and four years later, NATURAL BRIDGE CAVERNS—named for the sixty-foot-long bridge at the entrance that once formed the roof of another chamber—opened to the public. Today more than 250,000 visitors a year marvel at the underground wonders, including a fifty-foot stalagmite column and a room just under the size of a football field. See Points of Interest: New Braunfels