Just south of Tucson lies one of Arizona’s hidden gems—Kartchner Caverns State Park, an active limestone cave system known for its rare, pristine formations and year-round underground climate.

After an eight-year low of 119,000 visitors in fiscal 2011, the park’s attendance has been steadily rising, seeing 129,000 visitors in fiscal 2012 and almost 132,000 for the year ending June 30.