Tonto Natural Bridge, which is located near Payson, Arizona, is the 
            world's largest natural travertine bridge. The bridge is 183 feet 
            high and the tunnel is 400 feet long. However, due to the budget 
            crisis in the state of Arizona, many state parks have been scheduled 
            to partially or completely close. Fortunately, the Town of Payson 
            agreed to assist financially in keeping that park open until 
            September 27, 2010. I had visited Tonto Natural Bridge a few years 
            ago. Recently I went there again, because after September 27, 2010, 
            the future of the park remains uncertain.