Come on down (way down) at the largest underground attraction in Texas! Daily guided tours allow guests to explore large underground chambers and see huge formations. The largest room is bigger than a football field. Above ground, discover rocks, minerals, and rough-cut gems at the Natural Bridge Mining Company Sluice. The Canopy Challenge will test your agility on over 40 different obstacles while you are on our 4 story, 60 foot high Adventure Course. Then you can fly across the scenic Texas Hill Country on our zip-lines! (Canopy Challenge is open daily but weather dependent.)